a not well known term to describe a very attractive man capable of pulling any woman they want. they're very charismatic and are similar to the character stefan salvatore from the vampire diaries.
"oh my god.. that man is a stefussy! i've already fallen in love with him"
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).