Is there any way you can give someone QI?

Like, buy it from another user?

nope.

Not at all?

Aww...

I need like, 9k more QI and I suck at fights 'cause I am now blackbelt, and I really suck against black belts...

And there's no normal Judo room for Blackbelts, so that's also bad..

Buy Qi.
http://forum.toribash.com/tori_shop.php?cid=68

Qi trading never happens and never will.
Qi transfer have been conducted on the off occasion but in rare and special circumstances.