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1.
To steal little or more items without being noticed at all, or even persuade or lie the item(s) into your hands. A person who steals too much, or lies abundantly.
Dog, your lighter just got slifered.
Don't slifer my food, man!
Why are you always such a slifer when we hang out?
by NIKKZOR November 14, 2007
 
2.
Hamlet in central Iowa. Famous for its feral packs of dachshunds and ferocious sky dragons.
Jeff: Hey, let's go to Slifer.

Dylan: No man, Todd went there last week was attacked by a pack of wiener dogs!
by jfinch94 August 15, 2014