look up any word, like ratchet:
 
1.
Some shit that a straight man flashes when he's hanging with bro's and begins to suspect that the bro's suspect he's gay. He will then proceed to make a comment--usually of a lewd sexual nature--about a woman to publicly confirm his straightness to the other bro's and assuage fears that he wants their body.
Male Cashier: "Man, that's a real nice scarf. I've never seen anyone match their scarf to their sweatshirt so well."

*awkward pause*

Bro: "Um.. thanks.."

*hot girl walks by*

Male Cashier: "Oh hey look, the college girls are back in town. Looks like some fine ass scenery!"

--

The Male Cashier realized that he sounded a bit too interested in the bro's fashion choice. He brought out his straight cred to fix this critical error.
by Tha Infamous December 28, 2009
 
2.
One or more females associated with a guy or group of guys to create an image of heterosexuality.
Katie Holmes, Bar Refaeli, any chick with a pack of dudes

EXAMPLE 1:
Jim: Hey, look at that hot chick riding in the back of that sausage wagon!

Tony: Yeah, that's their straight cred.

EXAMPLE 2:
Dax begrudgingly brought his girlfriend with him to the lake as straight cred. He knew what a bunch of dudes in a giant boat shaped like a penis would look like to onlookers.
by Skeeball March 14, 2011