This seemingly innocent term (which derives from the art of 'bumping' iphones) is used to refer to people of the opposite sex who are attractive and 'Bump Worthy'.
Now used on nights out as a discreet indication to friends of potential men whom are worthy of a look and possibly even a smile. It tends to replace the word 'fit' which in our eyes is too obvious, tacky and lacks any element of subtley.
In addition - Power Bump refers to the elite members of the bump force, who are so attactive that they take our breath away. Generally these are celebrities and basically; exceedingly good looking - in every way. Almost everyone agrees on power bumps.
The act of a regular fist bump, yet the fist is upside-down. This kind of fist bump is a rejection of the purpose of the fist bump, yet must be done for the purpose to fit in.
Ted: Dude, I just totally busted that wimp in the face
Victim's Friend: Oh, yeah man
Ted: (Requests a fist bump)
Victim's Friend: (Uses an Upside-Down Fist Bump)
rump bump means that when a man grabs a woman/man by his/her hips and shoves his hard erect penis into her ass crack, while in the process of pulling his/her pants down. then, they shove the person on the ground, get on top of the person and rides them like a pony, then you go 69 on their ass
damn bitch, i had sonia over last night and i tried to rump bump her ass but it was too flat and nasty, and she was terrible.
damn hoe, i had m&b in bed last night, they were the best rump bumpers i know.