a small musical instrument, typically polygonal in form, played by stretching and squeezing between the hands, to work a central bellows that blows air over reeds, each note being sounded by a button.
I play the concertina.
Doing a concertina is a sex position that consist basically in a group of interracial intercalated fat old couples, side by side, doing on orgy in synchrony, to simulate an concertina opening and closing ( instrumment)
Last friday me tina and some friends were Doing a concertina
An abbreviation of the quote, it means go and find it yourself, Im not going to help you.
"If it was up your ass in concertina wire, you would know where it is."