Biffing the Cheddar

Biffing the cheddar is an ambiguous way of being coy about an action you will or have performed. These acts may be innocent, but are often conveyed with a sexual undertone.

Bro, I spent all night biffing the cheddar to Christi Boner.

Yo Alex! Hurry up in the shitter! What are you- biffing the cheddar in there!?