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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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 song by Ariana Grande which is about riding a dick bicycle so hard all day and night that you can't walk straight.
In the song "side to side" Nicki Minaj says "wrist icicle ride a dick bicycle"
by Rebellereign November 7, 2016
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Ariana Grande's new bop. Metaphor of how you walk after a long sex night.
Sean is so good in bed he got me walking side to side
by jaureguisjaguar August 30, 2016
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To have two sets of genitals/buttocks placed, artificially or naturally beside each other on ones person. In the case of genitals, the type of genitals is irrelevant, both male and female genitalia can be combined to achieve a Side by Side . In The case of buttocks, number of cheeks is limited to three or four, anymore is an abomination.
"After the surgery, ill have myself an ole fashioned Side by Side."
"Vincent was shocked to discover that Nancy had a Side by Side"
"None of my underpants fit since i got my self an ole fashioned Side by Side"
by Dr Wordplay October 29, 2014
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