awkward buttsex

The moment someone slips into another person's "clown-hole" and they don't actually know about it. So both parties just stay there, neither moving or acting sexually until it gets too awkward when the person's mother walks in offering snacks. In the further case of it leading to the mother joining in, it shall be called "Ye Old Mexican Prayer".

Jimmy: "Oh man, thought I could slip right in without her noticing. Guess not man..."
Harold: "Oh dude, you had 'Awkward Buttsex' didn't you!?"
Jimmy: "Yeah, then her mom walked in and did 'Ye Old Mexican Prayer' on us..."
Harold: "you're gross."