slang words of the same meaning, such as crap, are not used in such locutions. To wear a shit-eating grin means the person wearing it may be displaying self-satisfaction, smugness, embarrassment, or mischief. It may also be a playful evasion, as a response to the query "I'll bet you drank the whole bottle of booze yourself, didn't you?" Shortening of bullshit The expression no shit? (a contraction of no bullshit?) is used in response to a statement that is extraordinary or hard to believe. Alternatively the maker of the hard-to-believe statement may add no shit to reinforce the sincerity or truthfulness of their statement, particularly in response to someone expressing disbelief at their statement. No shit is also used sarcastically in response to a statement of the obvious, as in no shit, Sherlock. In this form the word can also be used in phrases such as don't give me that shit or you're full of shit. The term full of shit is often used as an exclamation to charge someone who is believed to be prone to dishonesty, exaggeration or is thought to be "phoney" with an accusation. For example: "Oh, I'm sorry I forgot to invite you to the party, it was a complete accident... but you really didn't miss anything anyway." "You're full of shit! You had dozens of opportunities to invite me. If you have a problem with me, why not just say it!" The word bullshit also denotes false or insincere discourse. (Horseshit is roughly equivalent, while chickenshit means cowardly, batshit indicates a person is crazy, and going apeshit indicates a person is entering a state of high excitement or unbridled rage.) Are you shitting me?! is a question sometimes given in response to an incredible assertion. An answer that reasserts the veracity of the claim is, I shit you not. Emphasis Perhaps the only constant connotation that shit reliably carries is that its referent holds some degree of emotional intensity for the speaker. Whether offense is taken at hearing the word varies greatly according to listener and situation, and is related to age and social class: elderly speakers and those of (or aspiring to) higher socioeconomic strata tend to use it more privately and selectively than younger and more blue-collar speakers. Like the word fuck, shit is often used to add emphasis more than to add meaning, for example, shit! I was so shit-scared of