My username is from a creative writing class I took back in high school. For a group project, we came up with a duck as the main character of our story, and at one point in the narrative, as a play on "ducky wucky," we had "dubby wubby" as an epithet for the duck. Anyway, the "dub" part comes from that, the "dell" comes from the location of the duck's hometown, and finally, instead of "give 'em hell," the main character is encouraged at one point to "dub 'm dell."
I also joined the site with a group of friends, hence, I chose an inside joke without thinking of the lysdexic repercussions. :P