Peg

(verb)
Written in the comments of an Instagram/general image post to show that you like the picture. Its a reference to the first lyric of the song "Peg" by Steely Dan, which goes "I like your picture." Not as formal as writing "I like that picture of yours," but not as informal as just pressing the like button

Charles: "Whoa, Kim posted a hot pic on her IG. It gets a Peg from me"