L5 Lumbar
The L5 Lumbar is the last bone in your back and the most useful bone when you're trying to be rude but can't say the word ASS. It's like having a swear word built into your body.
My L5 Lumbar is so big it's like it's trying to be my new best friend.
I used my L5 Lumbar as a substitute for the word ASS in my school essay.
My L5 Lumbar is giving me trouble again and I'm not even mad about it.