One who imbibes, or has imbibed, an excess of booze. A pisspot.
A: Met the new Science guy?
B: Jeez man, he said hello to me this morning, stank like a fucking brewery. Right drinkachu, that one.
One who emits a revolting bodily stench. A soap dodger. A shower opponent.
God, I got trapped in a lift with a right stinkachu this morning. Smelt like a tramp's mate.
One who imbibes an excess of alcohol and in doing so, conveniently (though not for those around him/her) "forgets" to perform ablutions familiar to those who refrain from pisspottery.
"Look at him - he's off his face"
"Christ - he was next to me at the bar earlier and he proper stank"
"what a drinkachu stinkachu"
someone you'd like to get your paws all over, one who is fit
Seen that Pussycat Dolls vid?
Yeah, dude, PAWSOME