Etymology
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zep (n.)

abbreviation of zeppelin, attested by 1915.

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Definitions of zep

zep (n.)
a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States;
Synonyms: bomber / grinder / hero / hero sandwich / hoagie / hoagy / Cuban sandwich / Italian sandwich / poor boy / sub / submarine / submarine sandwich / torpedo / wedge
From wordnet.princeton.edu