OH BAM

Where did this come from? Lately McKenna has been using BAM a lot. As in "Oh BAM, I forgot my drink." Or, "Oh Bam, I dropped my doll." I have NEVER heard this before and have no idea where she got it, but it is too funny. Last night she was putting her jammies on in her room. I was in Zachary's room changing his diaper and I hear her say "Oh Bam, stupid jammies" I about died laughing :)