Definition of vonce:
(n) :
(US, slang) Marijuana; cannabis, especially used as a drug.
(n) :
(slang) Sexual activity.
(n) :
(US, slang, term of abuse) A jerk; an unpleasant person.
(n) :
(Yiddish) Something or someone small and annoying. Used more as a term of endearment than a criticism.
(n) :
(slang, jazz) A state in which the musician produces great improvisation intuitively.
(adv) :
Pronunciation spelling of once, imitative of German-accented or non-native English. [(frequency) One and only one time.]