The act of taking a selfie while someone (or yourself) is farting.
Him: Here, let me take a selfie
Her: I think I just farted while you were taking the selfie
Him: Wow, we just took a smelfie
To take a selfie while farting
Yo dude, bout to drop a deuce, let’s take a smelfie
Taking a selfie during or following a fart, finding it difficult to hide your guilty expression and the waft of odor.
"Wanna take a smelfie with me"?