verb phrase. Do something squicky, gross, icky, or ishy, such as...oh, incest or whatever.
Real citation: "I just hope in order to have Victor win the Emmy, we don't have to have Jack cross the squick line."
(OLynn, "Jack "Spy Daddy" Bristow [a.k.a. Victor Garber]," April 28, 2005, Television Without Pity, http://forums.televisionwithoutpity.com/index.php?showtopic=507851&view=findpost&p=2860055)
Made-up citation: "My pet rat Yoda emphatically crossed the squick line when he ate his own poop. That's not a good Jedi master!"