Similar to a Dutch rudder but even less gay (not that there's anything gay about a Dutch rudder). Two guys stand side by side with their hands holding their own penis's, a girl stands facing them, she holds their wrists and pulls them back and forth. The shape resembles a catamaran.
Guy 1: Dude, have you seen the lats on Fiona?
Guy 2: Yeah she's been working on them pretty hard in the gym cause she's in a catamaran with Alan and Gareth
Guy 1: Damn I'd love to be those guys
people who sail catamarans, usually the 2nd most insane type of sailor. automatically classed as sexy/hot no matter what they look like due to the immense coolness of catamarans.
girl1: that guy is so hot!
girl2: who, that guy? he's not hot! i'd be surprised if he could pull a whale
girl1: he's a catamaran sailor!
girl2: oh, god i'd let him fuck me like theres no tommorow!