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1.
Derived from 'on it'

1. a statement of willingness to take part in task

2. Statement of approval

Antonym: Not ons it
A: Yo! do you wanna get drunk tonight?
B: ons it!

A: Bro are you ons it or not?
B: Im not ons it man
A: OH SKEEN!
by HHMMPP March 17, 2009