1. Sudden onset of tiredness, usually after being highly energized or inspired for a long period of time.
2. A magical effect caused by the approach of dawn, which happens at exactly the same time every morning, causing people who have been up all night to suddenly get very tired, sometimesto the point where they fall asleep immediately.
"Yeah, yeah, irc is gre-*SLONK*- zzzz..."
"Now all i have to do is finish off the enemy with my tanks while-*SLONK*- zzzz..."
"Sorry i'm late, i was up all night and i thought i'd be fine for work, but the slonk struck unexpectedly."
Justin Trudeau: You ever crank so hard your dick be slonkin on the ground?
Ryan: My dick only slonks when I be crunkin, not crankin, Justin
Justin Trudeau: Well when you crunk, give it a good o’l slonk for me
Ryan: Word