Kookster

Someone who can be regarded as eccentric, crazy, or otherwise senile. Generally used in reference to an older person.

That old guy at the store is a total Kookster.

by Schwag December 16, 2013

kookster

another term for a kook

That poser is a total kookster.
Dude, your a total kookster

by clowner April 22, 2007