To "shilam" one must aggressively lower their arm towards the ground whilst shouting the word SHILAM. Kelly Rowland has a similar motion when she exclaims "you put it down, baby gurl".
a combination of the phrase "the shit", and "hilarious". Commonly used to show how much one thinks another person is hilarious, and at the same time, the shit.
"Oh, Kristi Bisty! You're so shilarious!"
"Did you see South Park last night?! It was the most shilarious thing I've ever seen!!"