Moo Cow Rimmer Share definition Flag When a partner performs a masturbatory action on ones member, and similtaniously licks ones ring piece. Nicola performed a moo cow rimmer on me last night, she tossed me off while eating my ass! Moo Cow Rimmer by RebelRL June 18, 2007 0 0 Get merch Get the Moo Cow Rimmer mug. Buy Now — $32.95 See more merch