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
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