Glerk can be used as a sound effect in unenthusiastic/boring situations.
Glerk can also be used as a sound effect for something/someone goopy or weird.
I was walking up the stairs and I was sooooooo tired and the stairs were sooooooo long. Glerk!
The skin in between a womans breasts.
"Goddamn, Tori Spelling has a huge brode gap"