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1.
The transformation from a guys casual facial expression to the one he puts on right before he goes for the pink cave.

A mixture of a fake smile and complete fear.

Fake smile because he promised he loved giving oral
complete fear for what he might find and/or smell

Between bros and dudes it is often refered to as PLF
Example #1: She was smokin hot braw, and I wanted her so bad so I just had to put my PLF on.

Example #2
Dan the virgin: DUDE she gave me a blowjob, now I have to go down on her, but that place looks fucking scary.

Vinnie the experianced: Just get your Pussy licking face on and act like it is the best thing ever.
by Don Lyabb September 05, 2010