To use Blastard means to insult someone beyond comprehension. To put it in simple terms, it insults how you were born, your parents, your life, your friends, your life choices, and just you as a person in general.
Boy 1: Lol you have no friends loser
Boy 2: You better watch it before you get blastard'
(Audience): OH SHIT HE BOUT TO BLASTARD THAT FOOL
Boy 1: Yo I'm sorry dude I didn't mean it
Boy 2: Its too late
(Audience): RIP my nigga
The most real nigga alive. To mess with some that has this name means you're allowing someone to haunt you as you live and die.
Oh shit I messed with spookydino im finna be blasted while im already dead