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."
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When randomly, in the act of intercourse, a man switches his dong out for a Belgium sausage.
Marshall gave his girl the night of her life when he gave her a Belgium surprise.