Thumb Cum

The art of spilling one's sexual mustard onto his thumb after a session of masturbation.

I ran out of tissues after I had a wank lastnight, I couldn't wipe off my thumb cum!!

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Cum Thumbing

Verb

1. To merge two magazine pages together as one by means of bodily fluids.

"The fact that pages 136 & 137 were stuck together in the Hustler magazine at the sperm bank was an obvious indication that someone had been there cum thumbing it previously."