"It means funky. In a bad way. Like grandpa's laundry hamper."
This is a word that comes from the German word "mief", which means "an oppressive atmosphere, foul odour, pong, or stink". A German synonym for meef is "gestank". (Does that matter? Perhaps not, but I do think it's a hella funny word.)
I first heard "meef" used by my geek friends from Alberta around 1999. It successfully took root in East Vancouver after a great migration of programmers, DJs, and live P/A geeks to East Van in the late 1990s. In my experience it is normally used as an expletive ("Aaaah! Meef!"), a noun, or an adjective.
"This beer is tasting kinda old and meefy. Can I grab a fresh one from the fridge?"
"I don't want to go tonight. I just know that Meefopolis is going to show up."
Friend #2: No, we're just meefin for now.
2. I totally think Judith and Seamus are meefin. Today we drove by them and shouted "M.E.E.F.!!" and they got all embarrased and hid their faces in their wee scarves.
3. Girl: Hey Meefy! You have the most beautiful tatoo.
Boy: Thanks Meefcakes. You too.
4. Don't disrespect me in public, meef.
5. Meef to Meef: I'm not comfortable with you going to Rudy's with that girl. Do you wish you were Meefin with her instead?