I could be wrong, but I think that that was based on the joke, not the origin of it. From what I heard, it was someone's sig in the olllld days of the internet (when people used Usenet instead of message boards), and there was no reason for it, he just said it and people thought it was funny.
Just googled ramjet toast and I see what you mean Found a similar thread some one over at Allspark posted http://www.allspark.com/forums/index.php?showtopic=25209&st=0 Dinobot loves cake
In the past, Ramjet and Toaster united to defeat a common threat. Sadly, this storyline was glossed over in favor of another generic Decepticon uprising in Spotlight: Ramjet.
So Ramjet loves toast, Dinobot loves cake, Hot Shot loves JaAm!, and Cheetor loves pie. But the real question is: does Soundwave have something against bacon?