A shower that consists of copious amounts of cologne, body spray, and/or deodorant without actually showering. The purpose of the gentlemen's shower is to appear as a gentleman, even though you're a filthy slob who can't bother to shower.
John was running late for his interview so he took a gentlemen's shower as to appear as a functional member of society.
When your running late for a night out,and you do not have time for a shower so you stick your penis under the tap and give it a quick frantic rinse on the off chance you get lucky.
Hi Dave did you have time for a shower? No mate I only had time for a gentlemens wash.
A day consisting of hunting, kayaking to the tip of an iceberg, camping in 0 degree weather, eating large amounts of manly food harvested from the sea, and smoking cigars.
I recently spent four days in the woods and i may have found the meaning of Gentlemen's Day