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)
A figure of speech to describe someone who talks in a sardonic and distorted voice to describe disgusting things, not in a humorous way, but as a complaint that may come as disturbing and annoying to some as it might sound weird for the way the sayings are enunciated from the person.
This nagging woman is so cynical and impulsive that her complaints have no sign of understanding or grace for the feelings of anyone, and she talks with a derisive and annoying tone, like she's from the muck!