butler lie

(名詞) 用來禮貌地結束電子郵件、即時通或電話交談的謊言。

Yet technology is already laying siege to the butler lie. Services like BlackBerry Messenger enable mutual users to track when their texts are read, effectively torpedoing the 'sorry, phone died last night' excuse. 'Friend tracking' applications like Google Latitude allow people to geographically pinpoint their friends' mobile phones. So much for 'stuck in traffic' when you really overslept.
—Austin Considine, "New Technology, But the Same Old Lies," The New York Times, July 10, 2011

The Butler lie is a recent nomenclature coined by researchers at Cornell University. It's a smaller lie which is conveyed electronically and used to end a conversation. The next time your friend texts that he has to end the conversation with you because the waiter arrived, just maybe your friend isn't even at a restaurant.
—Donna Pinter, "Liar, liar, pants on fire," The Republican Herald, September 4, 2011