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an extended magazine increasing the capacity of a glock from 19 to 30
Ty rolls around the block with the stendo hanging out his draco
by nick123598 January 23, 2018
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It is a combination of a Stag and Hen do. True story. Newcastle is a great sten do location.
Bob: What the fuck is a sten do?

Greg: It's when people don't want strippers or to get shitfaced so they have a super PC party.
by Royce aka 'screech' September 18, 2019
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A mixed sex 'hen/stag' do for gay couples.
It's jussy's Sten do this weekend and were going to get completely smashed!
by H2thehizzo October 16, 2010
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