The act of fucking people on the side while in a horrible long distance relationship. Since people cannot cope with long distance relationships they need the additional sexual satisfaction of having sex with other people. The long distance partner cannot possibly satisfy the other through the use of phone or web sex, so additional partners are required to quench this desire.
D: So how's your boyfriend in Vancouver doing?
J: So fucking bad, thank god I'm sidefucking.
D: Oh I know what you mean, sidefucking is essential. Like when I was dating that chick in Utah.
J: So fucking bad, thank god I'm sidefucking.
D: Oh I know what you mean, sidefucking is essential. Like when I was dating that chick in Utah.
by Tetherel November 7, 2010
The act of creating a new orifice in a person's side, and then raping the person using the new hole.
"Billy was mad at Timmy because Timmy had cut off Billy's left nut in a prank gone wrong, so Billy used his pocket knife to cut a hole in Timmy's abdomen, then sidefucked him. Timmy learned his lesson"
by cheesegrass September 5, 2007