gag bag - A gag bag is when you lower your sack into someone’s mouth a

A gag bag is when you lower your sack into someone’s mouth and make them gag so hard they might scream.

My friend did a gag bag on his crush and she screamed like a banshee.

I did a gag bag on my little brother and he ran out of the room crying.

My sister did a gag bag on her boyfriend and he threw up in the hallway.