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The pleasuring of a man's penis using your butthole, aka sitting on a penis.
dude 1: Hey did you see that guys crank?
dude 2: Yeah, I totally wanted to jump off my Busa and sideboss him
sideboss by gootboxybox July 7, 2014
A view of the female breast seen from a side; generally under loosely-fitting clothes. Very titillating (pun intended) and sexual without showing any overt nudity.
There is so much sideboob at Los Angeles awards shows!

My brother's g/f's sideboob totally distracted me from my own g/f.
sideboob by Nutty J September 17, 2005
Word of the Day on January 16, 2009

Sideblob 

A jacked up, unnecessary showing of side boob.
"Damn GiGi! Put that sideblob away right now!"
Sideblob by Loveliest41 September 15, 2015

tasteful sideboob 

The breast on the side in public that makes you become erect in seconds
John: Steve's gf has some tasteful sideboob
John's gf: WHAT?!
Sideboob, a very large sexy individual who is loving and caring. He also looks as he is a sideboob. His real name is Camden
SIDEBOOB I MISSED YOUUUU
Sideboob by B4rney April 6, 2019
A view of the female breast seen from the arm side; generally under loosely-fitting clothes. imghttp://www.tsbmag.com/wp-content/uploads/2007/09/natalie-portman-side-boob.jpg/img
There was plenty of sideboob on show at the awards ceremony.
sideboob by wirby January 22, 2009