Spaydar 

The ability to spot a transgender person based on that person's appearance. Similar to gaydar.

"Yo, I got some serious spaydar going off on that dude. You don't think.... (pause) Nahhhhh!"

Spaydar by r-check June 1, 2007

Swaydar 

Detection principles or means of detection relating to one's abilities to observe the drunkenness of a particular individual or group. Typically helpful for individuals hoping to save their drunken friends from making mistakes, or helpful to bouncers in selecting individuals to keep an eye on.

"Dude, did you know Bill would be drunk enough to hook up with Sara tonight? She's got that jacked boyfriend who'd fuck him up so bad"

No man, I knew he was drinking pretty hard and everything, but my swaydar definitely didn't pick up that he'd fucked up enough to something that dumbassed and risk getting his shit fucked up"

Swaydar by Bryaaaan June 2, 2009

Shaydar 

Short for Shady Radar. An ability that all sheltered white people believe they posses, but is only accurate in a small percentage of them. Similar to gaydar, but instead measures the likelihood of a person or thing to commit or be involved in criminal activity.

"That kid in the glasses over there looks chill, but my shaydar says he's a low-key drug dealer."

Sheltered white kid one: "Uh oh, watch out, there's a skin head coming down the street"

Sheltered White kid two: "Nah, don't worry, that guy is just trying to look hard, he doesn't even register on my shaydar"

"I hate driving through Compton, it makes my Shaydar go crazy"

"Watch out, that cop car reads a negative 4 on my shaydar, but the cop driving it is an 8!"

"That windowless white van over there is making my Shaydar tingle!"

Shaydar by SB-HippieSage December 26, 2009

Slaydar

radar of chicks that you are currently slaying or are trying to slay.

Drew: So still banging the Asian Persuasion?

Eric: No, I hung out with her a couple weeks ago, but she has been off my slaydar for a little while.

Slaydar by Rico Suave and Brody Epic April 16, 2007

Spadar 

Deriving from the word radar. Spadar or Spade-ar, is used when in sight of a Bro. Never a sight you wanna see.

Guy 1: "Hey dude, look at that faggot bro over there!"

Guy 2:"Hold on, let me check my spadar"

Spadar by The Spence October 8, 2008

Slaydar

A detector for telling who slays.

Person 1: "The slaydar says u slayin' today."
Person 2: "And I'm pushin' P too."

Slaydar by Blite33 May 5, 2022

Slaydar

Metalhead equivalent to gaydar where one metalhead instinctively recognizes another.

I was at this indie show and one of the guitarists on stage was playing a seven-string Ibanez, occasionally windmilled and looked uncomfortable with NOT playing fast. My slaydar went off and I talked to him after the show; my suspicions were confirmed. We wound up talking about our favorite bands.

Slaydar by Karl Av-Mørket February 25, 2014