Beanie babies are small plushy "teddies" developed by ty company. Some people use them as toys, but there was a lot of people collecting them years ago.
My mom mum had about 5 or 6 shoe boxes full of them, it really was a strange hobby.
@Noreturn's edit to the word 'mum': 'mum' is predominantly used in Britain and is also counted as a definition for the word 'mother', despite being less formal and partially incorrect, I still prefer using it over 'mom'.