1. The act of tricking someone into buying you something, because you have no money.
2. The act of secretly adding to the original specified amount, while leaving another to pay.
"Dude, Helena just double bageled me at the store this morning!"
"Watch out! Helena is a total double bageler."
The act of eating two bagels for breakfast and later destroying the handicapped bathroom stall.
Brian just had a double bagel and I cant go in the restroom for at least 30 minutes.