Leaving a large group of people with your significant other, saying you are going to "warm up the car" but are really engaging in some sort of sexual activity with them. Much less suspicious when said in the winter, but is extremely fishy in the summer.
Boy whispers to girlfriend: "Hey baby do you wanna go warm up the car?"
Girlfriend whispers back: "I thought you'd never ask."
"Hey we'll be back in a few minutes, it's cold outside so we're gonna warm up the car."
A couple leaves to 'warm up the car', and one person says to the rest of the group: "Wait, why are they warming up the car? It's the middle of summer!"
Fogey/fogy /fougi/ sl. (early 18C+, orig. Scot) old-fashioned, stuck-in-the mud.
Person with old fashioned ideas which he is unwilling to change: Come to the disco and stop being such an old fogey!
You think me an old fogeyand an old tory, his thoughtful voice said. I saw three generations since O’Connel’s time. I remember the famine. Do you know that the orange lodges agitated for repeal of the union twenty years before O’Connel did or before the prelates of your communion denounced him as a demagogue? You fenians forget some things. (James Joyce, Ulysses. PenguinBooks,1992. p. 38)