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To download a file, esp. an application, to a smartphone or other electronic device outside of the accepted or usual channels.
The app center says the eBay app isn't available yet for the new OS on my phone, so I had to sideload an earlier version from a Dropbox link I found.
sideload by Eduardo Suave September 7, 2011
Related Words

Samoan sideloader 

A version of a mini bus (aka any green tarago) versatile so it can get in underground carparks and take the family to church every Sunday.
That's a hectic samoan sideloader

SureLoaded 

SureLoaded is a media Promotional platform which was created for the publication of your talent.
I download my songs from sureloaded
SureLoaded by Yemyht March 6, 2023
To upload or download information from the side of a PC, usually through a USB port.
sideload by Jerse47 March 1, 2009
To transfer content from one device to another, within a range of permitted devices. Often you need to do this within a certain time frame
If you haven't got time to watch that movie on your PS3 then just sideload it to your PSP and watch it on the train
sideload by DJDK August 1, 2011

Sideloading 

When someone isn't following a trend or refuses to do something everyone else is doing
Guydude: hey everyone is wearing red tomorrow. you're going to as well right?
Guydude2: Nah I'm not like the rest of yall
Guydude: man, you're just sideloading
Sideloading by Ratatatataolloi April 24, 2024