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1.
to classify something as top quality, the best. Basically describing something on a scale.
Aye, that cake was on 10.

"You seen that girl fool?" "Yeah, she was on 10!"
by Kyshaun February 29, 2008
 
2.
to be pissed, at the peak of your tolerance for something.
"nigga im so mad right now, niggas got me on 10."

"Im bout to fuck somebody up boy! Im on 10!"
by only one T June 12, 2008