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A girl at my school with the last name schlack sucked an upper classmans wang and was given the nickname schlackemoff.
Schlacker refers to one who sucks wang.
It can be used as an insult to anyone who swings on someone elses nuts.
OMG OMG, kristina sucked dereks wang.
What a schlacker...

Kohl totally pissed me off today by being at school.
What a fucking schlacker.
by GH REP July 18, 2004
One who schlacks; lacking behind in things
Holy hell! He's such a schlacker!
by Mackie Oldfield April 14, 2008