If it was after your seventh birthday party, I would imagine that at least Ma and Pa Beaker heard of it. Possibly a few other Beakers, too, depending on how many siblings you have and their age(s) at the material time.Who had heard of it previously?
Nobody.
Case proven.
For the record, it Is now not 'unheard'.
Get out of that one.
And your dog is chewing the doorframe.
Um, at least two people.
It was previously heard of, as I have just established.
I just did with incredible panache and a mere suggestion of aplomb.
No, she's not. She's pissing on my foot.
Finally, for the record, it's 'an' ASDA.