"crinkly dinker" describes someone or something that's needlessly complex, confusing, or inefficient. It could imply that the person or thing is causing unnecessary complications or difficulties due to their actions or attributes.
Despite his promises of efficiency, his approach to project management turned out to be a crinkly dinker, leading to unnecessary complications and delays.
A phenomenon where the penis makes a pop or snapping sound while masturbating, much like the sound of bubble wrap being stepped on.
See also: "snap, crackle, cock".
"Dude, what's that crackly noise I keep hearing through your bedroom wall? You eating Rice Krispies?"
"Nah, I was just jerkin'. Crinkle dick."