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2.
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
 
1.
Disgusting, like seeing your perants kiss.
"Erlack, my perants are snogging in the other room!"
by H to the L September 13, 2004
 
3.
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!"

"Erlack!"
by H.M. Switz May 25, 2008