A common phrase used for a boy who likes to lick someones arse hole in an attempt to be everyones best friend!!! This is hence why a bagel looks like an arse hole!
'He is such a bagel that boy! I wish he'd stop licking my arse!!!'
A bagel is a type of creature that is composed of bread exclusively for the most part and you know like think of like a tire right like a rubber tire...A tire has a hole in the center and it's surrounded by rubber. That's kinda like what a bagel is, but with bread instead. And uh, bagels can be interesting.