1)When a man becomes so aroused that two blood vessels begin to pulse urgently along his shaft.
2)A great rage that causes the rager to have veins swollen on his or her forehead.
1)Maggie dabbled with Bobby's nubbins until a double blue veiner was upon her.
2)The kids would badger their mom until a double blue veiner danced across her brow. They knew then it was time to skedaddle out of there and go watch Blues Clues.
Masturbation.
In other words:
Choking the chicken Choking the monkey
wacking off
jerking off
shaking hands with man's best friend teasing the weasel
Dude, we all know that last night you did the five finger knuckle shuffle on the one-eyed, blue-veined, purple-headed, custard-chucking, salty yogurt slinger.