Green’s Dictionary of Slang

blotter n.1

1. (US) a drunkard with a seemingly infinite capacity for alcohol [plays on soak n.1 (1)].

[US]Ade Knocking the Neighbors 157: He was the original Blotter. When they were trying to pry him away from it, he would take a chance on anything from Arnica to Extract of Vanilla.
[US]J.A. Shidler ‘More Stanford Expressions’ in AS VII:6 436: A drunkard is a ‘funnel,’ ‘tank,’ ‘blotter,’ or ‘sponge’.
[UK]K. Fearing Big Clock (2002) 100: ‘Listen, this fellow is a human blotter.’ ‘All right, get drunk with him, if you have to.’.
[US]Wentworth & Flexner DAS.

2. in drug contexts.

(a) a small piece of cotton through which a drug solution is filtered as it is drawn into a needle.

[US]J.E. Schmidt Narcotics Lingo and Lore.

(b) any drugs that are retrieved by soaking or boiling such a cloth.

[US]ONDCP Street Terms 3: Blotter — Cocaine.

(c) (also blotter acid, blotter cube) a dose of LSD carried on a small square of blotting-paper; the paper and the drug it has absorbed are consumed together [acid n.1 (1); for a specimen list of names for such doses, see zebra n. (6)].

[US]Current Sl. V:4 8: Blotter acid, n. LSD soaked in paper.
[US]R. Sabbag Snowblind (1978) 94: He could hit you with lids, caps, keys, tabs, nickel bags, blotters, buttons, spoons and everything from milligrams to boatloads.
[US]L. Kramer Faggots 161: A hit of Blotter by 4, acid not usually ingested so late, but a long night was wanted.
[US]D.E. Miller Bk of Jargon 336: blotter, blotter acid: A dose of LSD impregnated in a small segment of paper.
[US]R. Price Breaks 101: He had been busted for selling blotter acid.
[US](con. 1970s) G. Pelecanos King Suckerman (1998) 167: This guy I know, Danny? He had this blotter, man.
Bubba Sparxxx f/ Duddy Ken ‘Take’m to the Water’ 🎵 on Dark Days, Bright Nights [album] Ate a ten-strip of blotter, been wiggin all week long / Y’all keep on, with that jibbery jabbery slippin out happily / Expose you pretty hoes with a dose of this hospitality.
[US]ONDCP Street Terms 3: Blotter cube — LSD.
[US]T. Dorsey Cadillac Beach 36: ‘Whenever I cross the Broward line, I get all jelly-like inside.’ [...] ‘That happens to me on orange blotter.’.
[UK]R. Milward Ten Storey Love Song 2: Johnnie from upstairs sorted him two blotters.
[US]N. Walker Cherry 17: I was going through a blotters phase.
[Scot]A. Parks Bobby March Will Live Forever 79: New stuff. Liquid this time, not blotters.
[US]F. Bill Back to the Dirt 120: Miles eyed the shape [...] it was sectioned off by many squares like graph paper [...] ‘Hell you got there?’ ‘Blotter acid’.

SE in slang uses

In phrases

on the blotter

(US Und.) charged with a crime.

[[US]Nat. Police Gaz. (NY) 7 Jan. 10/1: In tho meantime the sergeant had been making an ontry in the blotter] .
Junior Republic Citizen 21/2: It will be seen that the citizen who appears as number ‘90’ on the Blotter was arraigned upon a charge of profanity.
[Aus]Sun. Times (Perth) 3 June 9/3: [from McClure’s Mag.] A policeman took The Snitcher to the station where he was registered on the ‘blotter’ .
[US]N.Y. Tribune 24 Jan. 29/1: There’s a lot goes on in the precinct that never gets on the blotter.
[Aus]Smith’s Wkly (Sydney) 26 Feb. 3/4: The ‘Bouncer,’ a burly bloke with a police-blotter past, strewn with the prostrate bodies of victims of his justly- celebrated uppercut.
[US](con. 1948) G. Mandel Flee the Angry Strangers 384: They got seventeen cats indicted down there, dig me. They got the Brookside chief of police on the blotter, and a sheriff too.
[[US](con. 1950-1960) R.A. Freeman Dict. Inmate Sl. (Walla Walla, WA) 13: Blotter – a book in which arrests, etc. are recorded].
C.J. Sullivan Wild Tales from the Police Blotter 222: Then there is the poor working snook who gets on the blotter just because he was trying to do his job.