When you jerk off but accidentally start having sex.
"I can't believe you Janked last night!"
1.That car is jank man.
2. PersonA: Dude did you get the homework for the weekend?
PersonB: Yeah thats so jank its like 10 pages
To make fun of in a mean spirited way. Used in the Gulf coast tri-state Region of Alabama/Mississippi/Florida.
I'm finna Jank yo lil head, fat nose, no neck, Rough skin ass.