eff

1 of 3

verb

ˈef 

effed; effing; effs

transitive + intransitive

informal

—used as a euphemism for fuck in various senses of the word

You don't eff with [=mess with] the Tupac legacy. You just don't.

—Olivia Jade Khoury

A guy who likes you a bit more than you like him generally … doesn't eff with your mind.

—Jessica Knoll

She told them to eff off [=scram].

… he sees this age of mass travel, mass entertainment and mass culture as the best of all possible ages. Anyone who disagrees, he snarls, had better eff off now.

—Robert Carver

Toronto city council huffed and puffed, the Ford brothers blustered and bullied, the mayor even admitted to buying drugs while in office, and there were renewed apologies: "There is nothing else to say, guys. I really effed up [=messed up]."

—Toronto Star

They threatened to eff him up if he didn't cooperate.

He says something at the end of the movie that effed me up [=upset or shocked me].

—Teresa Jusino

eff

2 of 3

noun

plural effs

informal

—used as a euphemism for fuck

—used especially with the as a meaningless intensive

told him to shut the eff up

… the bug that flew directly into your eyeball … may have caused you to freak the eff out.

—Megan Falk

"… Now they're bleeding firing at us! They've never done that before—what the eff's going on?"

—James Clavell

Who the eff doesn't like fry bread?

—Julien Perry

eff

3 of 3

abbreviation

efficiency

Examples of eff in a Sentence

Recent Examples on the Web

Verb

After all, hair grows from the root, so don't eff it up by putting stress on your root. —Jihan Forbes, Allure, 25 Oct. 2021

Noun

Throw on a clean shirt and get the eff out of your home. —Carley Fortune, refinery29.com, 12 June 2024

Shay Mitchell is on the trends, you guys, keep the eff up! —Elizabeth Logan, Glamour, 21 Sep. 2022

Word History

Etymology

Verb

spelling variant of ef, representing the initial letter of fuck entry 1

Noun

spelling variant of ef, representing the initial letter of fuck entry 2

First Known Use

Verb

1938, in the meaning defined above

Noun

1954, in the meaning defined above

Phrases Containing eff

• eff off
• eff with