A gay man who enjoys foreplay, such as kissing, cuddling, manual stimulation, fellatio, and analingus, but not actual sex.

As with anything, discuss any risks and comfort levels with any potential partner(s) prior to having sex. Have real conversations. It’s okay to like what you like and not like what you don’t, as long as you don’t mislead anyone.
“Are you a top, a bottom, or vers?
“I’m more of a side.”
by alternabear June 16, 2018
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Having an extra sex partner. Having sex with a friend as in friend with benefits while in a relationship with someone else.
I like fucking him on the side, just like I like ordering my salad dressing on the side.
by Frisco Stories August 13, 2008
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When you help someone in studying for an exam they have no clue about and they end up with a way better grade than you.
Person 1: "Help me! I don't know how to do this problem!"
Person 2: "Fine, I'll help you out."
*one day later, after the exam*
Person 1: " So how did you do, I got a 73?"
Person 2: "That's it? i got a 92!"
Person 1: "Damn it! Sided again!"
by durejavu March 6, 2019
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a) someone's sidekick

b) an offensive term for someone's mistress or lover
If you want an on-the-side definition b), don't be in a classical ltr; look for an open relationship instead.
by Sexydimma June 4, 2015
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Having a sexual relationship with a person outside of one's primary, emotional relationship.

See, mistress.
"Hey man, I heard you were getting a little action on the side! Did you nail her?"
by Nathan V. August 7, 2008
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a) humorous, someone's sidekick

b) (very offensive): someone's mistress or lover.
I'd rather have an on-the-side definition a) than an on-the-side definition b)
by Sexydimma December 9, 2014
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A place in a parallel universe where everyone's keys eventually end up
"Honey, where's my keys?"
"On the side"
by TMB June 17, 2003
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