the few tiny hairs that grow on the sides of a persons upper lip. often seen on mexicans and young boys who can't grow in a full mustache yet. reference to the "mustaches" on catfish.
sorry, you can't grow a real mustache yet, but those little whiskers on the sides of your lips are shaping up to be a pretty good catfish mustache
by taniawarf August 16, 2010
: is a very thin-sparce mustache with only a few long hairs on the corners of the mouth. (aka usually only grown by Mexicans)
The criminology definition to identify q person with sparce facial hair is described as having a mexican catfish mustache.
by Mexican Catfish June 24, 2010