The act of thrusting one's hand toward, or in the general direction of, another's groin without actually making physical contact; such act entails the exclamation of "Dobson grab!" by the perpetrator. Although possible of any sex or sexuality, it is usually enacted by homosexual men.
Peter: Dobson grab!
John: Dude, what the fudge did you just do to that guy?
Peter: I Dobson grabbed him.
John: Is that legal?