a cousin eddie
A cousin eddie is when you're about to catch a big fish and some idiot moves their line over yours like they're trying to steal your dinner.
My cousin eddie tried to steal my fish again. I almost pulled my line out of my hand.
He moved my line when I said I had a bite. I was so mad I almost yelled at the lake.
He moved my line again. I swear if he does it one more time, I'll beat him with my fishing rod.