After a chick has given you a blowjob, you fart in her face while she's trying to swallow your jizz, causing her to gag/puke/ect. Named as such because Ana Faris seems like the only chick you could do this to, and she might be cool enough to hang out with you for the rest of the night.
"I gave my girlfriend an Ana Faris last night, but she's lame so she got up and left."
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