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Ul stands for upload, as aposed to DL for download.

Originates from way back in the BBS years, when giving something back for ratio on said said server.
"I'll UL that file for ya m8 it'll be there in a sec."
UL by Julia Rosendahl June 10, 2008
Related Words
Stone: ul
Doob: wtf does ul Stone XD
Stone: uncontrollable laughter...I made it up.
ul by Stonemansrs November 19, 2010
1. To close a school for a longer period of time.

2. To have riots and protest on campus.
1. The University of Liberia has been ul because the instructors have not been paid for over two months.

2. Because of constant protest and riots the government uled the state owned university.
UL by Aketella June 19, 2022
"UL" is most commonly found on Reddit. UL subs are made in response to popular subs that have incredibly stupid auto-moderators that automatically remove 99% of posts with zero explanation (or a bullshit explanation).

r/showerthoughtsUL and r/AskRedditUL are the more famous ones. r/TrueUnpopularOpinion does not have UL in its name, but still falls into this.
UL by Ubeenbamboozledson June 20, 2023
Underwriters Laboratories, Inc. You see their logo all over the house (assuming you live in America and have electricity). They help you make sure you choose safe electric-powered stuff.
My laptop has a UL in a circle under it.
ul by GWR Definition Agency January 1, 2005
Ultra-Left
I love going UL on homework assignments. Really makes school interesting and not boring as shit
UL by decentralism November 8, 2011