What is Royal Sampler?
1.
A hand of cards in poker containing all red cards. Strictly speaking the hand is worthless, but proverbially it is known as a royal sampler.
Carl: No, no no, Homer, you have the Royal Sampler.
See
2.
When a girl gives you a blow job and has both vaginal and anal intercourse on the first date.
"Yo, that dude must be a monarch; he's had like twenty royal samplers this year!"
See