I used to play a game with a guy I worked with to see who could come up with the silliest goodbye using the word "bye". I started by telling him
"bye-cycle" and after a few days we began a banter
"bye bonds"
"bye-polar"
"bye-bye birdie"
"bye-ceps"
"bye-annual"
"bye sexual"
"bye-assed" (biased...ok so he got me with that one)
that's a few of them... it's really funnier when you are doing this on a regular basis with someone...