A derisive term utilizing a Cybertronian explitive "slagging" a rough analog of the "Eff" word,describing hardened dross from the smelting process.

The word slag is also a defamatory descriptor in the UK. Combining the aforementioned and Bayformers a portmanteau of Michael Bay's surname and the Hasbro property Transformers
Slaggin' Bayformers ! :-L - DarthNotsonice
by Morrandir March 31, 2010
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