MOMO (ALSO MO-MO) Share definition Flag a moron or idiot; a goof, tool, ass clown; botard; asstard The guy is such a momo that Id like to beat him like left-handed, red-headed stepchild. MOMO (ALSO MO-MO) by weave March 27, 2003 0 0 Get merch Get the MOMO (ALSO MO-MO) mug. Buy Now — $32.95 See more merch