My wife and I have a couple of terms that we frequently use.

• SET - "South Eastern Twat", used to describe a pretend-farmer, with gilet, flatcap and Landrover, who are so frequent in this part of England. We used to live in a more down-to-earth part of the country, so have allergic reaction to the stealth-wealth and snootiness you find down here.
• "There's no need for buttering the pan" - a description for ovulation days, when my wife gets quite randy :)
• ALTHAB - "At Least They've Had a Bath", which we use as a short-hand for "the kids had baths yesterday, won't need one today and therefore, if we push through, we can get them to bed early and might have some calm time together, in front of the TV, playing a boardgame or whatever is required to reconnect.
• HPS - "High Pressure Sex", a joke used to get us both to relax about those moments when you feel like you ought to have sex (you finally have a night away or whatever), but neither of you can be bothered (too tired, too stressed etc.).