Guadalajaran Siege Weapon
When you put your dick between your legs and a girl starts to give you head from behind. She has her nose in your asshole and throws up all over your dick after you fart on her. Then you turn around and open your legs and your dick slings forward like an eskimo's trebuchet and puke splatters all over her face. Boom.
Yall remember when Jake eskimo trebuche'd? Its like that but with a better name! She got hit with a Guadalajaran Siege Weapon!