Half of one word (Bungalow) and another (Caravan).

A Bung-a-Van is one of those little huts that old people spend their holidays in.

usually built near sea-sides, although sometimes built in country-side for unknown reasons...
old man -"ooh dear lets go for a holiday to the bung-a-van"
old biddy -"yes lets, being retired and driving slow really tires me out"
by Rebecca Davies March 6, 2008
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