Green’s Dictionary of Slang

seam n.

(US drugs) $10 worth of phencyclidine, wrapped in tinfoil.

1993

(con. 1984) K. Scott Monster (1994) 247: [His] mother was selling angel dust – PCP. Tookie got two seams (a seam was a ten-dollar package in tin foil).

SE in slang uses

In compounds

seam squirrel (n.) (also seam wolf)

(US) a body louse.

1899		J.R. Skinner Hist. Fourth Illinois Volunteers 129: When it was first rumored that the old confederate seam squirrel had invaded our quarters, a small panic seized many.
1918		L.N. Smith Lingo of No Man’s Lnd 24: COOTE This is a species of lice with extraordinary biting ability [...] also called ‘seam squirrel,’ ‘trouser rabbit’ or ‘shiny lizard’.
1918		National Geographic June 499: They call the things ‘pants rabbits’ and ‘seam squirrels’.
1928		J. Callahan Man’s Grim Justice 17: Yer lousy [...] the seam squirrels are rambling up and down yer back.
1933		C.W. Willemse Cop Remembers 58: Everybody was lousy too and I began almost immediately to suffer what the men called ‘seam squirrels’.
1939		Indiana Gaz. (PA) 2 Nov. 35/2: Persons refer to the seam wolves as shirt-rabbits and lining squirrels.
1940		C. Rawson Headless Lady (1987) 42: I just picked up a couple of dandies [...] seam-squirrels and circus-bees.
1944		P. Kendall Dict. Service Sl. n.p.: cooties [...] seam squirrels.
1950		Goldin et al. DAUL 188/1: Seam-squirrel. (P) Any vermin that infests clothing or bedding.
1961		(con. 1945) G. Forbes Goodbye to Some (1963) 76: Toss a little zinc in there. The Seam-squirrel Miners Union will go out on strike.
1989		M.R. Berenbaum Ninety-Nine Gnats, Nits, and Nibblers 232: Pediculus humanus, variously known as the head louse, body louse, grayback, cootie, seam squirrel, or motorized dandruff.

In phrases

down to one’s seams [the seams of one’s empty pockets]

(US) absolutely impoverished.

1876

Butte (MT) Miner 8 June 1/3: I was bound to make a scratch, being down to my seams, as it were, with the hashman and the landlady.

red seam (n.) [the red seam that runs up the uniform trousers]

(W.I.) a police officer.

1989

C. Hyatt When Me Was A Boy 15: There was a red seam policemen that them used to call Mawga Lion.