An annoying abbrieviation for “Best Friends Since Kindergarten” that only annoying, white girls use on social media excessively to encourage questions about it for attention.
Annoying white girl: Omg my BFSK is coming over! She’s my BFSK and we are going to do BFSK things together because we are BFSKs.
Everyone else: shut the fuck up.
Everyone else: shut the fuck up.
by CloverHD April 24, 2018