High School Make-Out Session, when two people make-out passionately, usually in public, long after they have graduated from high school. The make-out session tends to last too long and be too sloppy, which is totally unbecoming of two adults, but they simply haven't stepped up their game after all these years. The term also implies that the hook-up will not make it past a make-out, again, just like high school. The term carries a bit of shame with it because it shows a lack of bedroom prowess, but at the same time HSMOS's are fun because they remind you of being a kid and tend to be safer and less awkward afterward than say sex.
"How did things go with that guy at the bar last night?"
"Nothing, just an HSMOS, but he said he'd call"
"Nothing, just an HSMOS, but he said he'd call"
by sweet lips February 28, 2008
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by Magic Eight July 20, 2012
Get the Hsinwei mug.hssnd is pussy upside down. You can use it to say it to someone that you know they might find it offensive so if you send it that way and they will never know
by Ihatenormiez2000 April 24, 2017
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by hsdofiahfd May 6, 2021
Get the hsdofiahfd mug.A worshipper of the Jade/Hsi-Wu couple, which was completly ignored despite being the most valued and emotional aspect of Jackie Chan Adventures, most fans abandoned the show in drones after no attempt was made to follow up on this, as it was a breathtaking peice of original writing.
by David Griffin February 18, 2005
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