To strive for maximum girth, particularly in the penis. This can be achieved in many ways, one such method is Reverse Jelqing.
"Man, I've just been girthmaxxing all day I don't even know where I am right now."
a euphemism for sexual intercourse, popularized by the web series Bravest Warriors
"oh we're about to have all sorts of sassy num nums"
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When someone says something exceptionally unfunny, usually childishly so.
Wow man, you really just pulled a Moist Charlie. I'm disappointed.