What word does your mother always say?
1620s, caskette "small rope or plaited coil used to secure a furled sail," of uncertain origin, perhaps from French garcette "little girl, maidservant," diminutive of Old French garce (13c.) "young woman, young girl; whore, harlot, concubine," fem. of garçon (see garcon). Sense of "packing (originally of braided hemp) to seal metal joints" first recorded 1829.