Its thought that its usage comes from the well-known wit of Chris Lambert, a CBBC host in the early 90's famous for his put-downs.
'Dude, that guy totally berted you'
'I lost at one touch one bounce'
'Yeah, you were berted pretty bad'
'Take one step closer and I will bert you'
'Its a fine line between looking cool and looking as if you've been berted'
'I dont like your friends- they kept berting me.'
The insult is usually witty/nerdy, referencing nerdy subjects, but also including a powerful put-down
Guy #1- Dude, youre such a nerd
The 'Bert'- At least Star Trek will last forever in peoples memories, whilst your pathetic life will wither away to an alcoholic daze of prostitution.
Guy #3 - Ohhhh! You SO got Berted!