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1.
To hide or smuggle items in ones anus
Goodman figured keistering the dildo would be just the trick to avoid detection by store security
af KC Is A Knob Gobbler 21. april 2009
 
2.
To inject drugs up your or someone else's rectum. Also known as a booty bump. See crystal meth.
Adam came down with a nasty sore in his ass from keistering too much meth all weekend.
af sonomachris 18. september 2006