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Origin - from the fountain pen collector community.

You go to a yardsale which has just opened and expect they might have a whole load of nice pens, pen parts, etc., and then you ask the folks there whether they have any of those.

Most likely they would reply "Some guy bought them all this morning."

"Sumgai" is the short form of "some guy," if you become a sumgai, then you're the lucky person who got to those yardsales (or antique fairs, online auctions, whatever) and bought those pricey pens or pen parts for a v low price before someone else came along and bought it.
You're looking for pens? I had a small box of plastic pens with veiny patterns on them, some in Black and White and some in Blood Red and Ivory. But sumgai came along this morning, mumbled something about a man called Patricia and offered me a $10 for them all. I asked for a $50, then he haggled down to $25. $25 for 4 plastic sticks ain't bad right?
sumgai by Gunther Wagner September 26, 2005
The name of a mythical super-collector, who always gets to flea markets/thrift stores/yard sales/boot sales/etc. and purchases all of the worthwhile merchandise you are personally seeking out. Also spelled as "Sum Guy."

Started in rec.games.video.classic, as the name of an individual always invoked by sellers who would tell inquiring collectors "yeah, we had a lot of <insert collectible here> until some guy came in and bought them all." That line, or variations, was so common, that it was determined that there was a single person wreaking all of this havok, and the sellers were actually stating his name- Sumguy.

Applicable to all frustrated collectors who shop in vain for their favored items.
I found a Vectrex overlay at this yard sale; I asked the guy running it if he had the Vectrex still, and he said that he had the system, a few dozen games, the 3D Imager, and light pen, but that Sumguy had just bought it all less than 5 minutes before I got there!
Sumguy by SG Fan November 1, 2004

Hampster Sumggler

A person who has a bush so big it looks like hampsters in their pants.
Damn! That chick is a hampster sumggler!
Person 1: Is that SumGuy?

Person 2: I can't tell, who the fuck are you talking about?
SumGuy by SumGuyStan January 28, 2023

The Sumgleeses

The sumgleeses is a very versatile word which can be used to replace any word when someone cannot think of a good word to use in his/her sentence
Man, im hungry like the sumgleeses
Maybe you wanna take the girl back to your place, and the a lil sumgleeses?
The Sumgleeses by Matt Rivera October 2, 2005

sumgamcho love dive 

sumgamcho love dive the best phrase in Ives love dive also best used in. Coachella preformance Ive slays 💅
someone:what is your naem

mi:sumcanco love dayve sumgamcho love dive