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A sweet little nomnom looking set of bumcheeks that taste even better than a Smarties McFlurry, usually used in the description of a Woman's or a Lady's bottom
" I shall now call you sexy-face mcbumbum"
"That skinny waitress has quite a mcbumbum"
"I'm going on a diet, I want to get a mcbumbum"
by Brandygut January 21, 2013