What's all the 'up' lately?

[Debian]

I'm sure it used to be trained, headed, listen... etc.

Now, all of a sudden it seems, everyone says trained up, headed up, listen up...

Why the superfluous 'up'?

 

[Dayvo]

Probably because they're too far far up themselves!

 

[gazmercer]

Everyone must've been watching UP on Disney DVD

 

[Debian]

Probably because they're too far far up themselves!