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1.
When you insert your flacid (limp) penis into a females vagina and then get an erection and proceed with intercourse.
Girl: "What the fuck are you doing! Ughhh get awa... Oh oh baby that's nice."

JustinBryant: "Oh yea baby, you just experienced a Belgium surprise."
by Jbizz34 September 21, 2009

Words related to Belgium Surprise

belgium flacid intercourse sex surprise