Turtle Lipping
When someone performs a blowjob with their top and bottom lips turned inward, resembling a turtles beak. It is unknown where this originated, but it does not feel good, and anyone who tells you it does is lying to spare your feelings. Cut it out.
Friend 1: "Dude, that girl I left with last night gave a terrible blowjob. She was turtle lipping the entire time."
Friend 2: "Damn...sorry to hear that."