Can someone PLEASE explain the phenomenon of Biting the inside of ones lip

[experienced punter]

I used to love biting my ex's lip inner outer it didn't matter I'm a great kisser.....

[Alec Horan]

Enough is Enough I say! I am on day 4 now of biting the inside of my lip when Im chewing. I never had this happen before! It happened once and then I guess it swelled a little bit, and then I just kept getting it in my chew till it got more swollen. I just did it again right now, while eating my chocolate cake. Im getting really annoyed and wonder why this keeps happening. Im just chewing like normal, so why do I keep getting my lip in there? Anyone have a very high knowledge of the phenomenon of accidental lip biting?

Uncontrolled Biting !

Remind me not to ask you for a blowjob.
I'll just have a wenk instead.