The Bat Signal is a hand gesture consisting of the pointer finger on one hand and a hole made with the opposite hand while moving the index in and out simulating a sex act.
A girl asks a friend of hers how she should let a guy know she wants to take him home. Her said says "give him the bat signal".

Two male friends are at a bar, one friend asks the other "how can I find out if she'll put out without directly asking her"? His friend replies "give her the bat signal, you'll have your answer after that".
by That ain't no sock in my crotc December 17, 2020
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A sex move move where the male ejaculates on the lamp shade of his sexual partner, with or without their knowledge. Henceforth, every time they turn on the lamp, the 'bat signal' will be projected on to a wall or ceiling.
I did The Bat Signal at this girls house last night. Because I'm the hero she deserves, but not the one she needs right now. So she can hunt me whenever she turns on a lamp. Because I can take it. Because I'm not a hero. I'm a silent guardian, a watchful protector. The dark knight.
by M T Hammer June 9, 2018
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When a man takes stretches out his scrotum with his hands, then someone puts a flashlight behind it to illuminate the shadow on the wall.
Ray-Ray's wife was greatly suprised, when she arrived home, opened the door to her bedroom, and found her husband sending her the bat signal.
by zion August 19, 2004
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The batsignal is an alert put forth by Magic Online users to alert other users of scammers in the classifieds section. It is generally put up by a disgruntled member in spite after they have been scammed. It is also the signal used in the popular Batman movies to receive Batman's attention.
You're the scourge of the earth and you don't deserve to live" "Cheers for the tix brah, don't put up the bat signal!
by BODSKATESH August 6, 2011
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A mass text message or email that informs your friends of an impromptu social event.
Researcher 1: We've been sequencing DNA for 13 hours; I need a ton of beer and a dance party, in that order.

Researcher 2: Hell yeah! I'll put out the bat signal.
by fisdpdt June 1, 2007
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while fucking a girl reverse cowgirl style, have her stretch out her arms, while taking a flashlight and shining it on her back and start singin the batman theme song... The result will be a 'bat signal' on the wall
'batman dodah doo batman' flashlight produces the bat signal
by caelous May 18, 2008
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a stealthy maneuver done to a guy while he is either asleep or passed out. when you take the scrotum-AKA the ballsac and stretch both sides, making the bat signal.
kid1: "have you ever been dooped?"

marines guy: "no...but i did get a bat signal once!"

everyone: "WHAT THE FUCK!?!?!"
by jneill June 6, 2007
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