Term used to describe the act of ejaculating into another person's beverage without him/her noticing, leaving the ejaculant to float around in the liquid, much like BP oil in Gulf waters
"When I ordered the special cocktail of the night, I sure wasn't expecting the shady
bartender to make it a Gulf of Mexico."
"Fred sure thought he was all sorts of swagg
before he discovered the Gulf of Mexico in his coconut water."
"Last night at the frat
party, Bill was taking everybody's drink to the Gulf of Mexico for free."