An act of foreplay or a signal to initiate intercourse wherein one party initiates the act while the other just kinda lays there.
"Dude, I tried to pick up some chicks at Da Club last night, but I didn't get any secs."
"Bro, don't tell me you started one sided dry humping."
See also My Ex-Girlfriend and Douchebags At Nightclubs.
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