Grooving the bag, Mamaa (Dudley Moore, Peter Cook)
http://www.youtube.com/watch?v=btS7-UoK2Oo
“‘We are going to groove it, the whole night long, baby.’ Now this presumably is a reference to the fact that the mother, having bought the bag, decides to make some indentations on it, to make some ‘grooves’ on the bag, a sort of decorative pattern.”
;-D