Slippery Brick

Approaching someone from behind, grabbing & pulling your cock up so the balls elevate with it, then straddling & dragging your dank ballsack across someone's shoulder.

Richard pissed me off, so I gave him a slippery brick

Crotch Paste

The gooey buildup of sweat, baby powder & dead skin that accumulates on/around a person's genitals after going without bathing for an extended period of time.

I tried to give him/her some head, but all the crotch paste grossed me out