Humans don't produce lotion, could be sweat, could be saliva, could be pee, or it could be THAT.
Ok, let's just call it lotion.
Just like the unbreakable shield vs the unstoppable sword, it's unclear who would win between the unstoppable technique vs unlimited lotion... oh...
By the way, how are we still using "Jiu-Jitsu" when it's "Ju-Jutsu", I thought the XIXth century british broken translations of Japanese had been left long behind!
In Brazil it's called Jiu Jitsu, not Jutsu. It is a Brazilian martial art.
Source: I'm brazileño
----------
Edit:
So I just checked the raws to confirm the "gunshot" attack, since it felt weird, and sure enough, the katakana was "GANSHOTTO", so it's likely correct.
But the kanjis though... They were 顔射, Face and Shot.
Shooting in the face, if you catch my drift.
Now, should we continue calling it "Lotion"?