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1.
When another person snaps(or yells) at another
"Don't start jappin at me"
by Marianne Hanna November 24, 2003
 
2.
getting upset over something that might only be upsetting to you; a freak-out attack
Where in the hell is my boyfriend, I'm jappin' out; and I'm gona snap and jap on him.
by fraase April 15, 2008