Quoted from "Pitch Perfect," it is a pun to state the phrase "Let's Be Honest" in reference to a lesbian or lesbian acts. In this particular case, this is a pun encouraging a girl to "come out of the closet," despite all the girls already knowing about her love for vagina.
Cynthia Rose: I have a confession to make.
Fat Amy: We all know where this is going. Lesbianest.
Cynthia Rose: This is hard for me to admit to you guys, but for the past two years, I have had a serious gambling problem.
Fat Amy: What?
Beca: What?
Cynthia Rose: It all started when I broke up with my girlfriend.
Fat Amy: Whomp, there it is!
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Play on words with "Lesbian" and "Let's Be Honest", often used by a guy to try to get a threesome out of a girl he just met at a bar or club.
"Are any of y'all into girls like I am lesbianest"-Drake.