Definition of Sideman:
An irrelevant and powerless guy, also known as a ‘flower-man’ and shows signs of ‘moist’ and ‘soggy’ behavior.
There are two types of Sidemen:
1) the ‘Bupsed guy’ who finances a girl’s shopping sprees and receives no sex in return.
2) the general wet-wipe; often a guy who is emotionally unstable, and isn’t rated by anybody — not even friends.
A Sideman is the male counterpart to a Side-chick.
Example:
Person 1: Whys John always around when James is here?
Person 2: Cause he’s a ‘sideman’!!