trouser snake
An elusive animal that comes in many shapes and sizes. The rare hooded trouser snake is more aware of its environment, but this snake likes to collect cheesy matter and keep it in its hood. Each snake carries a venom sack that produces a white venom when it reaches maturity. The snake's one eye also functions as its mouth and waste removal system. The snake does not like cold weather and will shrink in cold conditions. It thrives in warm conditions, such as the many burrows it spits into in order to mark its territory. When touched, the snake will swell up to twice its original size in order to frighten off predators.
(above from Urban Dictionary)
Most of the definitions related to the above refer to the active organ in general.... but not to the condition of "display" within a trouser-like garment.
Proper (such as bespoke) tailors usually ask the client during a fitting, "on which side, sir, do you dress?" meaning does the gent dangle his dongle left or right. The tailor can then make a critical adjustment to allow the pants to drape properly without revealing the male bulge.
In one or two fittings I have been asked. In one, the tailor (who I assume wasn't quite as straight as I had previously thought) gave me a physical adjustment, more like a flick than a grab.
In other fittings, dozens of them, nothing was ever said about my bulge, or, should I say, my lack of bulge!