What is Gangster Bump?
1.
1. extremely large pot holes; 2. hole/bump in a street or highway that could potentially pop a tire, crack a rim, or screw up your cars allignment
O damn!! That was a sick Gangster Bump I just went over!
See
2.
Its a more extreme version of head bobbing!
Andy: "Wow is that dude trying to remove his car interior!"
Seaward: "No..he's gangster bumping!!!"