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1.
One who is seriously crazy or deranged (needs assistance as soon as possible).
Person 1: "Wow that guy is wearing clothes..."
Person 2: "What a crazy loon!"
by Angry Salamander October 18, 2005
 
2.
'crazy' obsessed & possessive over her boyfriend.
Will "kick your ass" if you even breath near him.
Her boyfriend is the average cheater or manwhore.
Not a normal boyfriend.
She is a crazy loon she said I can't even talk to her boyfriend.
by I know manwhores August 07, 2006