quartermaster

the friendship or platonic equivalent of a wingman.

when someone is able to setup two friends and they hit it off straight away into a friendship.

chose quartermaster, because on a pirate ship, they're all mates!

"man that guy's a real quartermaster, if I've ever seen one!"

quarterkeeper

the non-binary equivalent of quartermaster
*see quartermaster

"they might not know it but they were a real quarterkeeper tonight!"
"yeah! who knew we'd hit it off so well!"

quartermistress

the female equivalent of quartermaster.
see quartermaster

"that girl was the best quartermistress ever!"
"I know right? we'd never be friends without her help!"