X-Mass Card

Put "Im sorry they cut your dick and you threw up from the anesthetic for the past two days and had your X-mass ruined" and I bet he'll get the message. And a laugh.

Or, you could go with some lame jokes that hint to it:

"Apparently this Christmas it wasn't just prices they cut in half"

"I was going to get you a hat for Christmas, now that you have two exposed heads"

"Be careful - once that anaethetic wears off, the burning will go and the chilling will begin"

"Looks like you got the one gift nobody wants under the tree"

"Apparently this year, we are not giving the gift of smegma"

"Don't worry, next year your gifts can only improve"

and so on

Give him a pair of scissors, or a band-aid, or something else to go along with the theme of being cut.