Reefer

Reefer may refer to:

Reefer (ship), a refrigerated watercraft
Reefer (railroad), a refrigerated railroad wagon
Reefing jacket (or reefer), a type of warm jacket designed for use by midshipmen reefing sails
Reefer, a midshipman engaged in sail reefing
Reefer, a synonym for cannabis or spliff (a cannabis cigarette)
Reefer, an aquarium hobbyist term for one who maintains and cultivates corals, sea anemones, and other invertebrates associated with coral reefs