"(It) sucks to suck" - A remark usually made after a person experiences misfortune and/or tells others about it. Can be used to ridicule someone, as a way of expressing annoyance or frustration with a complainer, or simply as an indifferent acknowledgement of the other person's misfortune.
Dude 1: (accidentally spills drink on shirt)
Dude 2: Haha, sucks to suck!
Bro 1: Ugh, I've got three exams this week and I haven't even started studying yet.
Bro 2: Sucks to suck.
Guy 1: Man, I lost my wallet last weekend, and I still haven't found it.
Guy 2: Sucks to suck, bro.