2) Adjective: Having effeminate or ineffectual qualities.
Derived from a truncation of "Bum-Humper"
2) "That's another bumper hit from Craig David!"
Used in parts of Australia as a noun ("You're a bumper, mate!") and occasionally as an adjective, e.g "He supports a bumper football team."
"He's too much of a bumper to ever work that out!"
"Only a bumper wouldn't be able to do that."
"That's a bumper thing to do!"