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A person, group, or organization so powerful (either by size or by influence) that it does not need to heed the rules or threats of others. It refers to the riddle "Where does an 800-pound gorilla sit?" (Answer: "Wherever it likes.") Primarily heard in US. Don't mess with that guy; he's like an 800-pound gorilla! These big corporations act like 800-pound gorillas, making up the rules to suit themselves.
See also: gorilla
An abbreviation for "like back" that is typically added as a comment on popular social media posts to encourage other people to "like" their posted content as well. When someone writes "LB" on one of my posts, it makes me never want to visit their page.
ten pounds of shit in a five-pound bag
rude slang Said of something that is physically overstuffed. No wonder you can't get your suitcase zipped—you've got ten pounds of shit in a five-pound bag!