Similar to the "t-bag" a male will have his balls descend into the mouth of another. However, rather than dipping aforementioned balls into said person's mouth, the balls are shaken or slammed from side to side in a bell-ringing motion.
I t-belled the he'll out of that girl last night. Really rang my bell.
Similar to t-bagging, with the added action of swinging one's scrotum inside the recipients mouth as if it were the clapper of a bell.
I knocked my balls around in her mouth for a bit; she really likes the T-Bell.