lifes a beach then you get sand in your knickers Share definition Flag its all fun & games...then not so much...shit happens...life sucks etc etc... by the time a woman is 35 she knows lifes a beach then you get sand in your knickers. lifes a beach then you get sand in your knickers by baglady2713 July 4, 2018 0 0 Get merch Get the lifes a beach then you get sand in your knickers mug. Buy Now — $32.95 See more merch