sled head · noun1
From sled + head. From being an issue with the head due to a sled.
sled head · noun2
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A concussion or subconcussive injury caused by tobogganing, including luging, skeleton, bobsledding, tubing; that stereotypically leaves the victim woozy or muddle-headed. Full definition →
From sled + head. From being an issue with the head due to a sled.
Etymology from Wiktionary, CC BY-SA 4.0.