Home › Words › O › outseamoutseamoutseam means the seam of a trouser up the outside of the leg.Among words judged in Lexicurio's Arena, outseam ranks #2,710 of 42,752 for Qualifying.EtymologyFrom out + seam.nounThe seam of a trouser up the outside of the leg.Definitions & examples from Wiktionary (CC BY-SA 3.0).