The real saying is: "gird your loins", which means to "get ready". So I guess "grind your loins" has been made up, and is probably a euphemism for having sex.
grind axes
by grind....do you mean salt or pepper?
my body loin
Belly and Loins! Belly and Loins!
Youngin' on his grind refers to a young man doing his routine work. Youngin' meaning a young person; grind as in, "Back to the old grind".
How loud is a "loins" roar? I have never heard my loins roar.
your mean
If you mean how big the world is then its probably GTA San Andreas.
Having an axe to grind means holding a strong opinion or personal grievance that one is inclined to promote or act upon, often to the detriment of others. It suggests a hidden agenda or ulterior motive driving one's actions or behavior.
back to work
loins act like thunder
If you have "an ax to grind," then you have a complaint to discuss with someone. The image is of you sharpening your ax to chop away.