A perfectly symmetrical shit stain on both cheeks leading from the ass hole, Often caused by a sloppy log that came out before the individual could separate his cheeks.
Person1: sir did u neglect to wipe ur rectum?
Person2: ah yes how could you tell Person1: because I have observed a butskut upon your nether regions.
A funny misspelling of "butt sex". Used sometimes in funny internet pictures depicting animals trying to talk like humans. Because of their diminished brain power, they talk/type like an uneducated person.