A milktache/delightfully white is the white line you get above your lip (around the philtrum area) after having imbibed milk.
A milktache does not always occur if careful, but may be inconspicuous to the person with it until someone points it out quite amusedly.
Magnus, a well-educated man with an aquiline nose and cleft chin, walked into the room of academics to have Isla point out his delightfully white milktache.
1. Leticia: Who's that chap who did Eggheads?
2. Julius, the History teacher: Now TODAY CLASS we WILL be doing a STARTER to get us up and READY FOR work. You will HAVE TO GUESS which prominent HISTORICAL figure I AM. Ahem. "It IS true that LIBERTY is PRECIOUS; so precious THAT it MUST BE RATIONED."
Alice, sniggering to comrade: Geez Isla, was it the guy who baptised the baby off the Vicar of Dibley?