Marlof was very close but actually you are right Bruce. I said adjective, 'fat bottomed' [top photo] and noun, 'girls' [bottom photo]. It wasn't necessarily two words. You're up!I can only think of Queen-Fat Bottom Girls but your clue seems to be two words...hmmm
But they do know what they are saying, it's just several drinks down the line when they become telepathic and only have to say a word here and there. It's not random! LOLThis is a bit like coming into a pub and finding a small group of people saying apparently random things to each other then roaring with laughter.
a bit Weird but quite amusing