periscope depth 

When a fresh a deuce is so large that it breaches the surface of the toilet bowl water, exposing the tip to air.

The toilet bowl is designed to use water to contain the terrifying smell of fecal matter. Naturally, when a load is large enough to reach periscope depth it stinks up the bathroom something terrible, requiring a courtesy flush.

"Whoa dude, did you just dump all of Bombay in this bowl? My fuckin nose is going to fall off"
"Sorry after all that built up sushi that dump reached periscope depth"

periscope depth by Broham Brosef March 1, 2008

periscope depth 

When your penis persistently peeks through your underwear fly, regardless of how many times he is readjusted, thus increasing the risk of tip zipper rash.

Hold on a second I need to adjust my drawers. My junk keeps playing a shadowy game of penile Groundhogs Day, you know,... I've been cruising at periscope depth all day...

periscope depth by willisdwaynetwayne December 26, 2009

periscope depth 

n. 1. when you are in a body of water (tub, hot tub, pool, etc) and you are floating at a depth such that just the tip of your penis breaches the surface of the water

{to one's friends in a hot tub}
"i'm at periscope depth"

periscope depth by J.Dizzie May 30, 2012

Periscope depth 

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.

Periscope depth by DickTurman March 23, 2011