A reference to describe someone who's got a hot body but also has an ugly face, or if the first thing you notice is their ugly face. This cover the whole scale of uglyness, a less refined man/or woman may find a muck face attractive.
Pete: That chick playing pool is a hootie!

Gary: No way she's got terrible muck face.

Pete: Look at her body man?

Gary: True but I can't look at her face for too long, and your just desperate!

Pete: Your right, but that's why they invented doggy style! Alright!
by speefer madness October 23, 2006
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Irish for ejaculating your "load", which contains semen and sperm, all over a sluts face, and hopefully she will have the common decency to fuck off afterwards.
A common practice in Ireland usually without the slut fucking off as they want more muck.
" jasus would ya look at that whooer!" said a Fat ugly Irish man
" She deserves the muck" said his even fatter girlfriend
"BLow the Muck on her face" said the fat ugly Irish man with a grin on his face
" No thats my dinner" said the irish model (Fat woman)
by Muckeroo July 23, 2010
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