Sassenach is a word used chiefly by the Scots to designate an Englishman.[1] It derives from the Gaelic Sasunnach meaning, originally, Saxon. The modern Scottish spelling is 'Sasannach'. As employed by Scots or Scottish English-speakers today it is usually used in jest, as a (friendly) term of abuse.ating Newest Oldest. Best Answer: Sassenach is a word used chiefly by the Scots to designate an Englishman [1] It derives from the Gaelic Sasunnach meaning, originally, Saxon. The modern Scottish spelling is 'Sasannach'.