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What is lactic acid?
The act of laughing so hard that your cheek muscles' anaerobic respiration goes into overdrive and overflows with lactic acid as a result.
hahaha, alan you're so funny my cheeks are full of lactic acid.
lactic acid - video
Lactic acid - what is it?
The burning senstation you get in your legs and buttocks after a really hardcore sexual episode.
after two hours of cunnilingus his/her tounge was filled with lactic acid.
While fucking her doggy style his ass and legs began to feel the effects of lactic acid and he could no longer stand