look up any word, like blumpkin:
 
1.
Glak is a simple term.
Glak means a geek whose a slag. Simple.
geek+slag=GLAK.
girl one: did you hear about what she did last night? *looks at a geek*
girl two: yeah! what a slag.
girl one: a geek and a slag, means one thing. GLAK.
by anonmaousbitch. March 14, 2011