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1.
When something has so much influence on your day to day life, or influences your thoughts and actions to such a remarkable degree that it almost because a symbol for who you are
Cory: Man you always smell like that good weed
Smiling: Weed be my motha f*ckin theme nigga

Parents: I don't wanna hear anymore of that 'rap music' in my house!
Rebellious Kid: Big L be the theme nigga!
by gra[ham]cracker July 14, 2011