Green’s Dictionary of Slang

sip v.2

(US drugs) to smoke cannabis.

[US](con. 1948) G. Mandel Flee the Angry Strangers 247: Louella took her little wary sips [...] Diane rolled her eyes up toward Louella. ‘Take harder hits on it; don’t sip it like your scared.’.
[US]Murtagh & Harris Who Live In Shadow (1960) 52: It ain’t like you’re smoking hop or inhaling snow when you’re sipping tea [...] You sip tea, you don’t get a habit.
[US]B. Rodgers Queens’ Vernacular 210: sip take a toke.
[US]L. Heinemann Close Quarters (1987) 18: Hey, m’man, ain’t ya sipped smoke before?
[US]Spears Sl. and Jargon of Drugs and Drink.

SE in slang uses

In phrases

sip at the fuzzy cup (v.) (also drink at the fuzzy cup)

(US black) to perform cunnilingus.

[US]E. Folb Runnin’ Down Some Lines 158: Expressions [...] that are [...] poetic (to sip/drink at the fuzzy cup).