What is cum whip?

The foam that accumulates as semen is lathered in the foreskin during a long masturbation session.

'Man, yesterday when I was wanking a made a shitload of whipped cum'

cum whip - video

Cum whip: slapping one across the face with a used condom, preferably used on a female member of their family.

dude she was being such a bithc i turned that condom inside out and cum whipped that hoe!