Mustard Slurpie

When a man puts Mustard in his urethra and has his lover suck during a sexual period. (It's spelt Slurpie for a reason)

Male: FUCK! IT HURTS!

Male's Lover: Sorry, did I suck to fast?

Male: NAH, IT'S THE MUSTARD.
Male's Lover: Well maybe next time we shouldn't stop in the middle to try a Mustard Slurpie.