Show off your bisexual pride in Vulcan!
Like with asexual, there WAS a word in the dictionary, but “dah-guvik” would mean “two sex/gender”. It would definitely be the word I’d use for botanical bisexuality, but for people, I changed it to match the terms for gay and lesbian. So, dah-guv-ashausu, two-gender-lover. 
Incidentally, the first time I attempted this design, I accidentally swapped “ah” with “uh”, making it say “foolsexual” instead. 💀
UPDATE: I now prefer the translation same-other-lovers, so these pins are on clearance!