Any type of penis sore or blister which is caused by an STD.
I knew I had herpes when I found a chanker on my dick.
Why do you keep scratching your crotch? Do you have chankers?
Verb; to insert one's fist into a partner's anus with a violent punching motion. Not for beginners. May cause serious problems with your ass down the line. Also, is very gross.
See "to punchfuck" for more.
I thought I had seen it all, but then I saw some punchfisting porn, and I couldn't get the image of prolapsed rectums out of my head for days.