Where one is subjected to public scrutiny. Usually by a backdoor exploitation.
Pyne: I've been Periscoped before. I've been on Periscope for some time.

Host: How did that feel?

Pyne: Quite painless actually.
by SydneyTom August 5, 2015
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The result of a morning chubby, the tip of one's wood will break the surface of the underwear as though to take a look around. similar to that of a submarine periscope.
"holy cow do I have to pee, but i'm at periscope depth and could take my eye out if I try.
by DickTurman March 7, 2011
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