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This is something closer to "weeb slang."

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!!!
by backstrokeBOI July 02, 2018
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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.
by 10321 November 27, 2013
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cute fishy who is in love with monkey (aka Eunhyuk)
Donghae is so adorable and you know it.

(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.

Donghae wants the D. (also Eunhyuk)
by DonghaeIsAFEESH January 05, 2013
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1. Korean pop icon of singing, dancing, variety shows, djing, mcing, and member of user popular boy band Super Junior.

2. Lover of Lee HyukJae and one half of the OTP.

3. Future husband of +Anjali Chopra Lee.
Did you see Donghae-Oppa on M! Countdown? He kissed Hyukkie on stage!
by MatthewScot January 09, 2014
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