honorary gay straight friend

A Platonic friend of a member of the opposing gender who, for whatever reason, does not fulfill the function of a boy/girlfriend, but they go back a number of years, they can confide in each other to a limited extent, and there is an expectation that things will not turn romantic/sexual. Similar to the "work wife" or "work husband" (assuming there is no affair). Bartenders, male and female, and a lot of workers with public-facing jobs tend to have many honorary gay straight friends.

"Nikki said she would text Mikey about the shin-dig we were having."

"Why would she text his ass? I thought she was with Craig."

"They're just cool. Mikey is one of her honorary gay straight friends."