A pointless handjob in which the giver of the handjob either holds on to the penis without any motion or yanks it up and down while gripping too tightly. Named after the infamous giver of the chanjob (some say it's mythical).
Friend 1: Dude was that your first Chanjob?
Friend 2: Yeah. She just held on and sometimes yanked really hard. I got off anyways tho.
Friend 3: Oh dude I thought that was just a myth
Friend 2: Oh no! This was very real!
When a female with an incredibly big butt chin, puts a penis in the crack with a little lubericant (usally spit, baby oil, or non-scented lotion) an does and up an downward motions thus making the penisejaculate all over the females face.
Trey: Hey did you hear?
Alex: Hear what bro?
Trey: Ashlyn gave Luke a chinjob, and he had to be rushed to the ER.
Alex: Oh. Wow what thats awful, but those are very dangerous.
The act of putting butter on a girls chin, placing ur penis on their chin, pulling their chin fat around ur wang, and then thrustingback and forth until ejaculation.