When A Dick isn't hard and it's soft and floppy resmebling a limp shrimp!
Jeremy couldn't get a hard-on for candice therefore he was sporting a limp shrimp.
Becky: "So I heard you gave Jay a hand job?"
Emma: "Nah, he had a limp shrimp."
An undersized penis
“Hey bro, you really have a shrimp limp dick”