PCB

"Professional Cock-blocker" someone who gets in the way of a person and their significant other spending time together and/or having sex so often they exceed the level of cockblocker.

"Your little brother is a PCB, he's always following us around."

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titty bridge

When titty fucking, the hands clasped over the penis while squeezing boobs together

Nothing is better than a well-lubricated titty bridge.