look up any word, like spook:
 
1.
Kept current on events or notified of the situation at hand.
Please keep me aloop of any new developments, my good friend.
by miguelone November 19, 2009
 
2.
A wierd, crazy person that is emotionally unstable
That girl that is beating off the principal is a loop
by BRad147 March 05, 2014