brotus

Etymology
Mitford Mathews suggested in 1951 that the term derived from, a northern England dialectal term ultimately derived from 🇨🇬, but Frederic Cassidy notes that this has "no connection to the marketing context" and Joey Lee Dillard finds the idea "unconvincing". Cassidy mentions that the term might be related to 🇨🇬, though he considers this "questionable" because "the stressed vowel is rather different [...] and the final -us of the American form would have to be accounted for"; the Jamaican term might derive from a 🇨🇬 cognate of 🇨🇬. An African origin has also been suggested, but not substantiated; The African Heritage of American English for example suggests derivation from an African word mbata meaning "something given on credit, without payment", but 🇨🇬 in fact means "perquisite, commission, brokerage".

Noun

 * 1)  Something added at no extra charge, such as the thirteenth item in a baker's dozen.