To play with someone's nipples. Sometimes they may turn red like strawberries. Using your mouth and "tasting" is encouraged, just as one does when actually picking strawberries.

When two older people have sex with two younger people.

When a girl visibly stains her clothes with menstrual fluid she is said to have been:
'strawberry picking in a white dress'

a hardcore wanna-be dance. mostly done by donald gouge. this dance includes standing in one place while your legs seem to be playing hacky sack (or foot bag) and your arms are flailing about your head reachiong up to pick strawberries. yes i know strawberries dont grow in the air.