What is 5 For 5?
When a womans vagina has been "used" to such a great extend that it now appears as flabby flesh flaps, similar to roast beef. Hence the 5 for 5 deal at Arby's where you get your fair share of roast beer for a nominal price.
Set the stage as one buddy to another after the successful conquest of a ripe young woman.
Johnny: "So yeah, I hit that last night"
Sam: "How was she, 5 for 5?"
Johnny : "Naw man (pleasant smile) it was like 1 for 99 cent!"
From this dialog Johnny and Sam were able to share information without hurting anyones feelings.