The act of not acting right -- One who is not living up to par. Forgetful in doing what you're supposed to be doing.
Hey don't let the boss catch you slippen.

OR

I can't believe you forgot to pay the rent -- Man you're slippen!
by Chula July 18, 2006
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General statement used by english "praktikants" in germany.

As far as we know, it means nothing in german. German women have no idea. :)
Used as a statement of affection/admiration/shock
chimp1 is sleeping on the sofa after 3 hours sleep.
chimp2 walks in and decides to wake him up.

"SLIPPEN SIE"
by chimp1 July 11, 2004
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