1. What sometimes comes up on new "smartphones" when you try to type "Sexy Bastard".
2. Reference to the male genitalia, primarily the penis.
"Dude, Sam just texted me that he's a sexy mustard...wtf??"
So then she said, "JT, I dripped a little ice cream on my chin", giggle, giggle - *insert silly, innocent smile* and I told her, "Don't worry DJ, I'll wipe it up with my Sexy Mustard".