A drinking contest where two men drink shots hand in hand until one man either (1) Passes out, (2) starts convulsing from alcohol poisoning, or (3) dies.
Your boy Pat thinks he's a real badass, but I can take him out in a brewhahah.
An uproarious party where people toss down copious amounts of malted beverages and guffaw raucously over every even-mildly-humorous remark that's drunkenlyuttered by any of the participants.
A brew-haha can also be a coffee-break where people swig cups of joe laced with nitrous-oxide and then "laugh it up big time" afterwards.