1. to perform rear-entry sex involving variable surface heights and limited lateral space, e.g. a stairwell
2. to modify the sex act so as to compensate for said limited space, e.g. shunting to the arm of a couch
"the couch was too narrow so we shunted off the side a little"
"this chick's shunting zone was so smooth i kept falling down a step"
"shit was crazy up in that piece, me and jamal ended up shunting in the stairwell"
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