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1.
Sometimes abbreviated as "high as G.P.", this phrase can be used in general to describe anything that is very tall or high-positioned (physically). It is sometimes also used figuratively when describing being "high" (under the influence of a substance, i.e. marijuana).
Man, I'm not getting up on that ladder. That thing is as high as G.P.

Dude, how much of that sh*t did you smoke. **I don't know man, but I'm higher than giraffe pussy...**
by LMSeattle May 25, 2010
 
2.
Achieved when one smokes so much chronic that they are as high as the ureteral vicinity of the Giraffa camelopardalis.
"Shit mein, I blazed so much dro, I was higher than giraffe pussy yesterday!"
by Martwamp December 10, 2007