it is also used when playing basketball a player dunks the ball and the person who got dunked on has the other persons nuts on there forehead or somewhere on there face
During consensual tea bagging, the girl is sucking on the guy's balls when he rubs one out from above. The distance he cums determines the bragging right.
"Yo he jizzed on my tits while tea bagging, he can't tea-brag about nothin"
"Yo she said he busted on her toes while tea bagging, how's that for a tea-brag?!"