An entity-relationship diagram; a specialized (usually dynamic) chart that illustrates the relationships between entities in a database, using a specific set of database-specific symbols.

(Britain, slang) Was here. Frequently placed after the author's name in graffiti.

(informal) in one attempt

plural of ER diagram

Censored spelling of fucker.

(UK) said to acknowledge a double entendre or something that sounds rude

Alternative form of never-wozzer

A person (especially an entomologist) or animal that catches moths.

Alternative form of ER=EPR

(physics) A conjecture equating the effects of quantum entanglement (EPR) with a wormhole (ER) connection between the entangled particles, relating quantum physics to spacetime physics.