Commonly resulting from a sudden increase in Cocaine fuelled meditation, KMDS can result in late night googling of one's self, foaming at the mouth, erectile dysfunction, uncontrollable crying, lazy eye and hair loss.
"He's 50 years old and been screaming at his computer screen like a baby all night, if he turns out to have Kicking Mustang Derangement Syndrome then at least he won't reproduce."
To properly perform the danger yank, one must pop a cialis/adderol combo, watch a Golden girls rerun at full volume, get into a wallsquat position without any pants on, and jerk it with a two-finger-overhead-away-from-the-brain quick stroke, attempting to climax before knees lock or your significant other enters the room...
If there was an awkward breakup conversation to be had before this point, you've just bypassed it... Congratulation Jism.
Tommy packed his car the night before Liz caught him mid Danger Yank. She wasn't even finished dialing her mom for tearful advice before he had the Datsun in gear, driving away from her bullshit. Glorious.