vonce noun5 •(US, slang) Marijuana; cannabis, especially used as a drug. •(US, slang) A jerk; an unpleasant person.That "Legs," I hate it and the little vonce knows it, so of course he's hittin me where I live, my lousy bowlegs. — 1963 •(slang) Sexual activity.Like we first met' and Checking in a lot of Hotels with those Twin Beds, my my how Lucille + I suffered every time that we did the Vonce (sex) you know? — 2001 •Something or someone small and annoying. Used more as a term of endearment than a criticism.“Promise you'll come and visit your tanteh soon or I won't let you go, my little vonce!” said his aunt, tightening her hold. — 2005 •(slang) A state in which the musician produces great improvisation intuitively."Man, when I was with Basie," he'd say, "we'd come up on the vonce, and the man would put the ding-ding here." — 2009 formsvonces