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Yikes; an expression of worry.
"My parents said we're going to have a family meeting tonight and I think they're going to take away my cell phone!"

by H.M. Switz May 25, 2008
Disgusting, like seeing your perants kiss.
"Erlack, my perants are snogging in the other room!"
by H to the L September 13, 2004
Really gross or unpleasant.
Girl: Wow, look at Chanelle's hair. Erlack!

Boy: Who left this pizza out over night? Erlack!
by Kraytheili May 12, 2009