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1.
The layer of toilet paper placed floating in the toilet on the water before deification, as to not splash any water on one's butt cheeks
I just threw down my base layer so I'm not soaked after this dump.
by rcp72 April 27, 2009
 
2.
(Used in public washrooms) The layer of toilet paper placed in the toilet so no one can hear the plop of your poop.
Man, I had to do a double base layer just in case for that one!
by Joey Jojo Shabadoo February 17, 2011
 
3.
when packing a bowl, the packer lays a few small nugs of mystery-nug greens underneath the rest of the bowl.
"hey man, i didnt get to smoke that bowl of mystery-nug."
~"its cool....ill base-layer this next bowl."~
by justin wheeler August 13, 2006