Green’s Dictionary of Slang

louse v.

[louse n.]

1. (Aus.) to search; to pilfer.

[[US] ‘A Song, How a Flat became a Prigg’ in Confessions of Thomas Mount 21: Saucy, lowsing, Billingsgate man].
[Aus]Smith’s Wkly (Sydney) 11 Aug. 15/2: Flash In dook, lugs cocked for the slightest alien sound, proceed to louse the joint.
[US]J. Mitchell ‘Professor Sea Gull’ in Joe Gould’s Secret (1996) 12: A couple of generations after I’m dead and gone [...] the Ph.D’s will start lousing through my work.
[Aus]R. Aven-Bray Ridgey-Didge Oz Jack Lang 11: The Beecham Pill had them pegged as dope fiends. [...] They were probably going to try and louse his kick for a shot of marijuana.

2. (US) to behave badly.

[US]E. Wilson 20 Mar. [synd. col.] I am going to out-louse the lady’s husband.

3. see louse up v. (4)

In derivatives

lousing (n.)

(Irish) hanging around on street corners.

[Ire]L. Redmond Emerald Square n.p.: By the time they were seventeen they were short-winded from smoking, slack from lousing at street corners [BS].

In phrases

louse (around) (v.)

1. (US) to idle, to loiter, to waste time [northern UK dial. lowse, to stop working].

[US]DN IV 414: Louse around [...] to play the parasite.
[US]DN V 214: Louse around [...] To loiter about aimlessly.
[US]D.M. Garrison ‘Oilfield Idyls’ in Botkin Folk-Say 149: I just racked my tools and loused around.
[US]B. Appel Brain Guy (1937) 111: No use lousing around.
[US]Monteleone Criminal Sl. (rev. edn).
[US]J. Thompson Alcoholics (1993) 57: Letting him louse around in a crummy old bathrobe.
[Ire](con. 1920s) L. Redmond Emerald Square 229: Mostly by the time they were seventeen they were shortwinded from smoking, grown slack from lousing at street corners.

2. (US, also louse up) to mistreat someone.

[US]Goldin et al. DAUL 129/1: That creep loused me around for my broad...and my case dough.
[US]W. Bernstein ‘The Cherubs Are Rumbling’ in Short Gang Delinquency and Delinquent Subcultures (1968) 26: It ain’t exactly what he did,’ Louie said.‘We just didn’t want to louse him up.’.
louse up

see separate entries.