1. (internet, informal) Been There, Done That

Encyclopedia: BTDT

• cobalt
• cobalt 60
• cobalt bloom
• cobalt blue
• cobalt ultramarine
• cobaltic
• cobaltite
• cobber
• cobble
• cobble together
• cobble up
• cobbler
• cobbler's last
• cobblers
• cobblestone
• cobbling
• cobby
• cobia
• Cobitidae
• cobnut
• COBOL
• cobra
• cobweb
• cobwebbed
• cobwebby