Something you say after spilling juicy tea or gossip. This comes from the CW show Gossip Girl where the narrator always finishes off a sentence with this.
A bunch of intelligent but smarmy prestige whores, with a smattering of racists and perverts. They ostensibly discuss law school and admissions once in a while.
Hugs and kisses
O=Hug
X=Kiss
If you look at each letter like it was representing two people from a bird's eye view, the "O" represents the arms of those persons hugging each other while the "X" is evocative of two people kissing each other.