n: slang
A tattoo used to identify sexually loose females.
Tattoo or "Mark" a.k.a. "Coaster" is located on the lower portion of females back. Usually the tattoo is of a butterfly or tribal design, sometimes both.
It can be helpful when trying to avoid the diseased sluts in a bar circuit. Most young woman who carry the mark also carry S.T.D.'s.
When Omni-man (Nolan Greyson) asks William where Mark (Invincible) is and the fact that he was supposed to be dropped off an hour ago form the current time of asking.
"Where's Mark, William...you were s'posed to drop him off an hour ago"
"Uhh Amber dumped him and he didn't like my advice so he went to go find Eve"
"Call him"
*Omni-man stares intently*