to place your own wants or desires over that of others. to pull a reeder. to place smoking weed over hanging out with a friend you already made plans with.
A phrase that's exact definition cannot be defined by simple terminology. The definition of "Reeder Bobber" can mean whatever the speaker want's it to mean. It is a blank slate word essentially.
"That was a real Reeder Bobber moment."
"That Reeder Bobber was great."
"You're a Reeder Bobber"