eat you under the table
Your friend can't handle your drinking challenge. He calls in his girlfriend, who says she'll eat you under the table. You accept. You lose the bet but get a full meal and a side of shame.
You challenged Steve to drink under the table. He couldn't. His girlfriend said, 'You can't drink? Let me eat you under the table.' You did. You got fed and felt bad.
You lost the bet. Your buddy's girlfriend came in and said, 'You want to eat me under the table? Let's go.' You ate her under the table. Now everyone laughs at you.
You challenged Mark to drink under the table. He failed. His girlfriend said, 'You can't drink? Let me eat you under the table.' You did. You're a hero, but you're full.