3sum
Threesome
Example
There were an odd number of people in the class, so when we paired off, 1 group had to be a 3sum
3sum definition by Slang.net
This page explains what the abbreviation "3sum" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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3sum is an abbreviation for "threesome," which refers to a group of three people. It is most often seen online or in text messages.
The abbreviation may be used in any context that involves a group of three people, such as a business team, class group project, or golf outing. It may also be used to refer to a sexual encounter involving three people.