Erectus Trouserous" Sticker for Sale by artdyslexia | Redbubble
Trouser snake Acrylic by Luke Chueh | Trampt Library
This creature is called "the trouser snake". They were first found in Brazil after the Medeira River was drained, their outside skin makes it look like they are giant grey penises :
Not Trouser Snake by vincentwolfe -- Fur Affinity [dot] net
the trouser snake « Jackass 3D Contest :: WonderHowTo
25 Trouser Snake : The 30 Characters Challenge
Man in jungle urinates and then reveals boa snake in his trousers | Metro News