Expression used when you spot a dapper looking older man and want to compliment him on his looks in a Rupert Everett type way with a view to future sexual contact .
My I say, you're looking 5p for a cup of tea today, would you care to share custard cream with me later...
When a man's fucking a girl in the ass and she shits on his dick. At the time he pulls out she puts peanut butter in her mouth and sucks his dick aka peanut butter cup!
Steven: "I got Tiffany to do the peanut butter cup last night."
Lee: "that's gross but you're legendary"
Steven: "her mouth was filled with peanut butter and " chocolate ".
Lee" Peanut butter cup!"