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1.
a speedo
every swimmer has worn a man thong at some point.
by sssshhhhyyyyiiiiittttttt February 27, 2010
 
2.
The condition when a man's underwear, usually briefs, have become so deteriorated on the back side that the material covering the ass cheeks has completely disintegrated leaving only the elastic band remaining. When exposed, the view from behind-to unwitting observers-appears like the wearer is sporting a thong.
Samantha: "I thought the plumber's crack was a nasty sight to witness. Yesterday, I saw a guy bend over at the gym revealing his man-thong."

Danielle: "Gross!"
by Perv Johnson February 12, 2011
 
3.
when pantsed after being pantsed but not having enough time to adjust ones boxers and till having them look like a thong when pantsed a second time
after pantsing him i realized that he had been pantsed moments earlier and had a man thong going
by oopsie October 10, 2009
 
4.
A Manthong is a metrosexual guy who is hangs out with your girlfriend and watches Oprah with her while talking about gossip magazines. This is the type of guy you could see wearing a thong to fit in with the girls.
John: "Dude, I saw your girl with Chet again."

Bob: "Were they getting their nails done?

john: "Probably, Chet is such a Manthong"

Bob: "Agreed"
by DeathByMullet April 18, 2008
 
5.
A Manthong is a metrosexual guy who is hangs out with your girlfriend and watches Oprah with her while talking about gossip magazines. This is the type of guy you could see wearing a thong to fit in with the girls.
John: "Dude, I saw your girl with Chet again."

Bob: "Were they getting their nails done?

john: "Probably, Chet is such a Manthong"

Bob: "Agreed"
by DeathByMullet April 16, 2008