Sendboy is a synonym for femboy, but the prefix send has the function of saying that an individual embraces elements of an opposite gender when put before a gendered noun like "girl" "boy" or "boi" and as such does not always serve as a stand-in for fem. Developed on Discord when some mods decided to ban the word "femboy" and we started debating mathematical proofs relating to femboys and needed a replacement so we wouldn't get muted.
sendboy = femboy
sendgirl = tomgirl
sendboi = femboi

You know what these mean.
by God Of The Cheese June 15, 2023
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The type of drunk bro who screams "SEND IT" from the porch of his frat while his friend pukes in the bushes. Generally, a person who overuses that phrase even though they aren't part of the climbing/biking/skiing/etc. communities that actually invented and popularized "send it".
Sendboi: Yooooo send that 40 bro, we send it in this house

~~~

Chad sucks - he wears shorts and sperrys in the winter, and to top it off he's a total sendboi
by Manhunt XXX November 29, 2017
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