The act of orally stimulating your lovers genitals from behind, resulting in either:

1.) Your partner getting rug burn between their butt cheeks from your mustache.

Or

2.) Your mustache collecting lint and other debris from the inadvertent action of stache-scrubbing their anus.

Named after 2018 Olympic Gold Medalist Matt Hamilton.

Used to describe (generally female) imagery that's suggestive, but in a PG-13 sense rather than an R or above sense.