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The practice of keeping your phone off or in flight mode most of the day to save battery and only turning it on briefly every now and then to check your messages, missed calls, fantasy football points, the football scores etc.

Like a WW2 submarine; coming up periodically to check their position and take on fresh air before going deep to avoid detection.
Jim: "Does Clive know we're headed to the Anchor, I can't hold of him? "
Greg: "He's periscoping so best just message him on Whatsapp to meet us there"
by Banksy1441 December 21, 2017
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The act of whipping the dicc out while fully erect and placing it carefully between the gut and the elastic of your underwear/assorted leg covering. This aids in either concealing the tiny/enormous size of the male anatomy. Males usually partake in this action while either being embarassed by their size or if they for example are asked to come to the front of the classroom for a presentation "at the wrong time".
Ah shit son mah dicc is soo rock hard right now and Mrs. Cocklesuck just called me up to the front of the class to present for show-and-tell. I guess Ill just tuck it like a periscope...also known as periscoping.
by BIG BLACK DICC June 22, 2007
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When you stand over a kneeling girl, facing the same direction, with your balls draped over her eyes such as would be the "viewfinder" on a periscope. Then she grabs the "handle" of the periscope, and aims you toward the intended target. Bonus points if she makes sonar ping noises.
"Last night I couldn't find Josie's butthole in the dark, so Debbie tried her hand at Periscoping, and steered me right on target. Boom! Sunk that battleship!"
by Mourning_Would November 23, 2016
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The concealing of an erect penis by folding it behind your waist band, leaving the head of your penis exposed underneath your shirt.
"Woops, I was just about to stretch out my arms but I realized that I was still periscoping."
by The Goodtime Boyz January 04, 2012
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the act of walking around an office with cubicles, and peeking over the wall to check out the worker. Usually done by tall male workers who think they are sly.
Effing Dwayne, he spends two hours a day periscoping all the ladies in accounting.
by Johnnie Bee February 02, 2011
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The act of giving a blowjob to a man standing up while giving handjobs to 2 men facing the guy in the middle.
I peroscoped your 3 best friends last night.

Periscoping is the new felching.
by MehMehMehMehMehMehMehMeh April 14, 2010
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When a guy calls you into the bathroom to bring him something and you walk in on him in the bath, lounging, fully erect. Not touching himself or asking you to join, just wanting you to be in the room.

The head of his penis bobbing up and down like the periscope of a submarine.
Oh my gosh, Mark is such a creep. He asked me to bring him his phone and when I got to the bathroom he was just laying in the tub periscoping.
by Connor Downs March 28, 2016
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