Cleek -- Is more than a word...it's an expression. Cleek is the word you use whenever something embarrassing happens or whenever their is an awkward moment that is building up and the awkwardness has to be broken so the world can move on, this is when you say cleek.
Cleeeeeeeeeek - This is the same as cleek but with added emphasis, hold the eee's 3 seconds or more.
2. Your at church talking to a friend outside of a restroom, while chatting, someone who you don't know walks out of the restroom with a long trail of toilet paper stuck to their shoe walking back into the sanctuary.. you would both say to each other "Cleeeeeeeeeek!!".
3. Your girlfriend's breath smells, and your not sure if she ate pesto or marinara sauce... but you can't offend her because then it would turn into a nightmare, so you hand her a piece of gum and say "here, your breath is cleek".