tipping the waitress
when masturbating over a girl the guy cums on her face. he then pulls up his pants, before winking and pointing at the girl "fonz" style before saying "keep the change" as he leaves the room.

** note - this only works if you do not touch the girl after you smear her face with your man fat.
"so, mark, how did it go with that girl last night?"
"oh, i tipped the waitress."
*high fives*

"are you on for tipping the waitress tonight?"

"i tipped the waitress last night, generously as well. i completely emptied my coin purse."