What you have to do when you wake up next to an undesirable 'mate' after a long night of drinking. You can't escape they are laying on your arm. So you bite it off to escape. Much like an animal caught ia a trap.
She was hideous. I had to become an arm biter to escape.
It's the morning after a long night of drinking and carousing. You wake up with a crashing hangover, open your eyes, and discover the person you brought home to have sex with is frighteningly unattractive. And since your arm is trapped underneath that person, you would rather bite your arm off than wake them up.
That girl is an arm biter....coyote ugly
Someone who would rather bite off their own arm than risk waking the (surprisingly ugly when viewed sober) person lying on it in order to escape.
Bob realised he was an arm biter on the morning he woke up next to a whalepig he had woken up next to after a rather large drunken mistake.
It's the morning after a long night of drinking and carousing. You wake up with a crashing hangover, roll over, and discover the person you brought home to have sex with. By the light of day you find that he or she is frighteningly unattractive. You bite your arm instead of screaming.
"How'd it go last night with ... what was her name?"
"Ohhh, man, that's awful."
Situation is the same, but in respects to an animal caught in a trap, such as a bear, which will chew it's own leg off to get away.
When Billy woke the next morning, he found the chick he brought home was a real arm biter. He began chewing is arm off.