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1.
When your fucking a girl from behind, just as your about to cum you raise your arms in triumph and let out a terrifying shreik mimicking the prehistoric winged animal...the Pteradactyl.
Last night when I was nailing my girl, just before I came I pteradactyled her and was like "AARAAAGHHH"!
by Martin Leggett October 29, 2007
 
2.
When your star is giving two hand jobs with arms out and sucking dick. The motion looks like a pterdactyl.

Submitted by The Wrong Demographic.
Three of us came home from the bar and Marty's girlfriend got naked and turned into a pteradactyl.
by the wrong demographic March 27, 2014