One who thinks that he/her are
punk, but really they are not and they listen to
simple plan and
good charlotte. Can also be used in reference to anyone who is trying way to hard.
Allister
Bean: dude check out my old school connies and my hardcore
simple plan t-shirt.
Random: clearly your beanin it....
or
Vinnie: Hey tony, check out my fully sick sub-woofer and ghetto blaster.
Tony: Vinnie your not even Italian, stop beanin it....