smart mark 

A person who is knowingly deceived, but values the entertainment inherent in the deception enough to continue to be deceived.

Some smart marks like to see a face lose in shoot screwjobs.

smart mark by Japanese linguist February 26, 2015

Smart Mark 

Losers with no lives, who do nothing but surf the internet all day.

That hermit down the block must be a smart mark.

Smart Mark by Plushtar February 17, 2004

Shart marks 

1. Flecks of poop shrapnel left behind after pooping in a toilet.

2. Marks left behind in your underwear from sharting.

After your daily deucing, check under the seat to make sure you didn't leave any shart marks, especially if you're pooping at a friend's house.

Shart marks by PooEtiquitteEnthusiast August 25, 2011

shartmark

when you have a diet high in greasy food, you leave behind residue in your underwear called shartmarks when you fart. your farts have liquid fuel that occasionally, accidentally end up with a bit too much substance behind them.

"too much take out has left Steven no choice to replace his boxers due to excessive shartmarks"

shartmark by stevenjchamplin December 26, 2012