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2.
Noun: Classy breasts viewed from the side. Similar to sideboob, but of the highest quality. Can be clothed or un-clothed, but the outline of the breast must be clearly defined.

The finest source of this phenomenon is sidebreast.com

See also: sideboob, boobs
Her boobs look good enough to qualify as sidebreast. Yeah, did you see her sidebreast when she leaned over to get that pen?
by sideboober November 23, 2010
 
1.
The worst form of a sideman. Can be used for males and females.

Shows moistness, and overall the worst sideman behaviour. Usually leaves friends 'hanging'
"man, do you lift?"
"Yeah, I lift...my legs when I walk"
Sidebreast.

"wna come 2 the cinema 2day?"
"Nah, gotta expand my knowledge on land economy."
Sidebreast.

"spud me"
"..........nah"
Sidebreast.
by l337n3s5 March 11, 2013