drank the kool aid

to make an unbreakable commitment. Inspired by the Jonestown Masaccre.

"Hey, you guys wanna go with us to Jamaica?" "Can't- we already drank the kool aid on those tickets to Saskatchewan"

mac

British short/slang for a long overcoat; a MacIntosh. Created looong before the computer age.

From "Substitute" by the Who..."I can see right through your plastic mac"