Donghae is a name for the "East Sea" or "Sea of Japan." It's a body of water that essentially connects the two countries (that historically don't get along).
Hence: Donghae (when used in weeb slang) means "After a slow burn (a long waiting period) your OTP finally get together." It's meant to be used as more of a sound effect or to punctuate.
Weeb 1: IT TOOK ED 64 EPISODES TO GET WITH WINRY! FUCK! WE'RE FINALLY HERE!
Weeb 2: DONGHAE!!!
Lee Donghae, or Donghae on stage, is a member of the 15 member Korean boy band Superstars - Super Junior.
He is one the group's visuals - along with Siwon - and is the partner of Lee Hyukjae, also known as EunHae (Eunhyuk and Donghae) OTP or One True Pair. He is also an actor. One of the main dancers of the group (Eunhyuk and Shindong). Kyuhyun once said during their Don't Don performance that he looks likes he's going to destroy the stage.
He is also member of SJ's sub-group SJ M and Super Junior Donghae and Eunhyuk.
Donghae is known for being a 5-year old kid trapped in a handsome man's gorgeous body.
(young child) Hey mom. I'd like a pet for Christmas.
(parental guardian) Okay, sweetie, what do you want?
(young child) I was thinking a Donghae, is that okay?
(parental guardian) Sure.
another term for a station wagon, mini-van, or any other kind of vehicle that is targeted at the "family" demographic(also M.A.V.)
"Tactical advantages aside, the M.A.V. is top of the line for the holy warrior troop transport manufactured by the Church of Latter Day Saints Military Industrial Complex. Also great for family trips...to heathen lands."
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.