A mature woman who is on her period but still chooses to dress up and go out.

Also a foreign dude who plays electric keyboard and sings old songs in a restaurant/bar.
Betty's got her red pants on but that's not stopping her from making out with that Jagger dude.
by Chuberly November 20, 2015
Get the red pants mug.
Similar to the elusive Purple Shirt of Sex, the Red Pants of Sex refer to the glorious pair of y-fronts worn by John Watson. The Red Pants originally were the devices of the brilliant Reapersun on Tumblr. The Red Pants of Sex even have their own day of the week (Monday) and are loved by many. In some parts of America and the UK, they are worshipped by many pubescent teens.
God save the Red Pants of Sex.
by Improbablebean April 7, 2018
Get the Red Pants of Sex mug.
Lady Red Pants is another one of Batavia's local bums. She is often seen wearing red pants and sleeps under the black stages at the Riverwalk. She is usually around Walgreens talking to her self. See also Gary Coleman.
Lady Red Pants is a crazy Batavia bum
Get the Lady Red Pants mug.
A proclamation of annoyance and little or no tolerance for the disregard of property, mainly that of roofs.
<Yokel> Hey, Joe-Greg-Billy-John! I can see down yer chimney from up here! Hee-yuck!
<Grampa> I suggest you get off my roof before I ignite your frilly, red pants, Johnny-Smithy-Jeevesy-Beau!
by Bastardized Bottomburp August 8, 2003
Get the I suggest you get off my roof before I ignite your frilly, red pants mug.