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1.
The combination of the words: Big and idiot. Pronounced as spelled in a quick tone.
You're a bigidiot; quit being such a bigidiot
by JARG July 20, 2005
 
2.
Phrase denoting someone who engages in an activity which they regret majorly later on, and affects either themselves or others in a negative way.
Girl A engages in activity with Guy B, which afterwards, Girl A regrets, and Guy B exploits. Girl A is a Big Idiot!
by PhyberOptik September 05, 2006