Gifth?

I just got an email promising to increase my length and my gifth.  I don't know about you, but I think 5'8 is long enough.  If I get any longer, none of my pants will fit.  I'll look like I'm getting ready for a flood, for cripesakes.

And what in the hell is my gifth?  If I don't know what it is, I don't want it increased, thank you very much.  (Unless it's that part of the brain that makes me a brilliant writer - then yeah, gimme more of that.)