It can either mean this :
a figure of speech by which a locution produces an incongruous, seemingly self-contradictory effect, as in “cruel kindness” or “to make haste slowly.” (I like the more modern incongruity coined by Arnold Schwarzenegger, "girlyman")
1650–60; presumed GR >oxymorum oxýmōron, neut. of oxýmōros sharp-dull, equiv. to oxý(s) sharp (see oxy ) + mōrós dull (see moron )
Or it could be this:
a cream indicated for use in controlling acne and/or stupidity.
2009; presumed GRaveyard shift 3:39AM oxy zit cream (see benzoyl peroxide) + moron your stupidity should be medicated (see grrrr)
Redefining words, one of many reasons I should not work graveyard shifts.