A covert way to tell a person to screw them self, or a way to insinuate that a man is literally screwing them self. 270 is the angle of the penis necessary to perform such maneuver, hence the brief and scientifically perfect synonym for an otherwise vulgar gesture. It is also a great way to respond to a person who is bragging about them self.
1. Oh really, did you do that with our without your 270 in action?
2. Really buddy, just go 270 in your room and get it over with. We already know.
3. Hey pal, go 270 yourself. Dry.
The equivalent of "mushroom stamping", reserved for those men who have not been circumcised. It involves slapping a person with the penis hard enough to leave an imprint on the recipient's body. If the person was circumcised, it would leave a mushroom shaped imprint. If not, a lizard tail. Hence the name- Lizard Whip
While my girlfriend was asleep last night, I lizard whipped her forehead. It turned out great, but I'm sure I'll be couching it for the next week.