Crack in the Sac

This morning, under the assurance he wouldn't get in trouble by his daddy, Roman came into the bedroom to rudely awaken me. "Mommy, you're late, get your crack out of the sac" followed by massive giggles and a quick "daddy said I could say it" So I played along and proceeded to stick my butt up in the air. When he again said "Mommy, get your crack out of the sac" I replied, "My crack IS out of the sac" to which he responded, "Put your crack back down and get all of you up"