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1. n. a square; a dull person. (From the square formed when a capital L comes before an uncrossed 7.) That guy is an L7.
2. mod. dull; square. This guy was real, like, you know, L7.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.