A heavy drinker, esp. a habitual one. A witty person who holds down the bar til the break of dawn; rarely leaves their post. Mermen enjoy the celebration of beverages and spitting game to random girls. Pertaining to one who buys rounds of grape bombs for all those around them.
"Merman was on point last night...he was buying grape bombs and pouring them down girls throats!"
"I can't go to the bar because I'm broke and I have zero game....Fuck that, Merman will take care of you!"