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.
by sonomachris September 18, 2006
1 more definition
To hide or smuggle items in ones anus
Goodman figured keistering the dildo would be just the trick to avoid detection by store security
by KC Is A Knob Gobbler April 21, 2009