DonGoof

DonGoof is the Slash ship between Donald Duck and Goofy from the Mickey Mouse and Friends fandom.

Canon
Donald and Goofy's relationship has always been bumbling idiot and angry straight man. Goofy will say or do something stupid and Donald will often scold Goofy for it, calling him a "big palooka". While Donald is annoyed at Goofy and his idiocy, they are still very best friends and Donald does care about Goofy. There were even classic Disney shorts that had only the two of them, as opposed to the short that had Donald, Goofy and Mickey as a trio.

Kingdom Hearts
Their relationship is more developed in the Kingdom Hearts series of games. In those games, Donald and Goofy work alongside Sora to save his friends from the Darkness. In Kingdom Hearts 2 when Goofy is killed by a falling rock saving King Mickey, Donald mourns Goofy's death, apologizing for the ice cream (alluding to an earlier scene). He cries and then rages, vowing to take revenge. When Goofy shows up later perfectly fine (He was actually knocked out cold), Donald hits him with his staff and tells him to never do that again.

The reverse happens in Kingdom Hearts 3 when Goofy runs to Donald when he passes out after using Zettaflare (A very powerful spell). He looks really upset but don't worry, Donald is fine.

Fanon
In terms of gay ships in the Mickey Mouse fandom, this ship is up there next to Donmick and The Three Caballeros (Panchito, Jose and Donald). It is the third most popular Donald Duck ship and the second most popular Goofy ship. While not a lot of fan fiction is made about the two, there is a lot of fanart made of them, usually depicting Goofy and Donald raising Huey Dewey and Louie together.

Fandom
Fan Fiction

Donald/Goofy tag on AO3

Fan Art

DonGoof tag on Tumblr