in bed
Words added to the end of any sentence to make it sound dirty. Works best when no one is expecting it, but always leads to an entertaining conversation. Overuse may cause your friends to pretend they're annoyed, but really they don't know what they'd do without you constantly twisting everything. When used in conjunction with that's what she said it can make class a lot more fun; especially choir because lyrics and vocal excerises are perfect source material. Abbreviated I.B.
Person 1: "She's very talented."
Person 2: "In bed!"

Person 1: "Make it look good!"
Person 2: "In bed!"

...you get the idea