It's the newest craze sweeping Milwaukee "The Miracle Whip".
When your girlfriend/boyfriend jacks you off onto your hand, then (useing the same hand) you slap your partner across the face their tears should combine with your ejaculate as it runs down the face. At this point you should be laughing at her/him, Bwah, Ha, Ha!!!
I'm really disappointed that you made my hand hurt after I performed the Miracle Whips.