What does the phrase "Drop your socks and grab your jockstraps" mean?

[Anonymous]

I don't get it but my lacrosse coach says it all the time

[Poppykate]

I think he is asking you to toughen up, and prepare for battle! Socks are comfortable! And your jockstrap offers protection/ support (armour so to speak).

[Asker]

haha interesting! that makes some sense! except for the jockstrap offering protection part. It supports but no protection other than the cloth?

[YOVANILLA]

I've never heard that before, I've heard "drop your cocks and grab your socks" which means hurry up and get ready.