A variation on the age old hobby of masturbation, an aspyxicrank essentially involves the masturbator using one hand to clutch at his throat whilst using the other hand to engage in aformentioned dick-strokage. During all of this, the user will be crying.
Without the strangulation, this would simply be a crank, something fairly hard tio achieve, due to the conflict of emotions in play.
Other variations include the danger crank, the reverse danger crank, and of course the the reverse danger asphyxicrank.
Damn, Pash dropped some acid and we just caught him having an asphyxicrank in his room. He was reading Birdsong.