A person that is both a rookie and a heimer
. Not to be confused with the 'dingleheimer
', this individual is (a) wack, (b) a noncontributing ZERO, (c) someone you definitely do not want to party with, be associated with, and especially not seen with. However, a person can experience rookinheimer lapses in their daily routine, not to worry, these will pass.
Johnny "Two-Timer": "...saw Sean at the party last night slamming Twisted-Teas with his girlfriend...what a rookinheimer!"