off the cuff

Without prior thought

Wilma had managed to avoid suspicion since she was good at coming up with legitimate sounding alibis off the cuff.

Channing Gets Tatum’d By Miley Cyrus, Olivia Munn, and … Matt Damon!
Who can forget the song, "(I Wanna) Channing All Over Your Tatum," performed by Jamie Foxx and his "White House Down" co-star seemingly off the cuff during the "Jimmy Kimmel Live!" post-Academy Awards show? We sure can't and, apparently, neither can Miley Cyrus. The 20-year-old lends her singing and acting skills — as well as her killer abs — to a special music video about the “Magic Mike” star ...
June 19, 2013 - omg!
Why a Microsoft Employee Is OK with a Rape Joke Made About Her at E3
Ashton Williams has clarified that she did not take offense, which does not change the fact that Microsoft prominently featured an "off the cuff" rape reference at the company's biggest presentation for one of its biggest products ever, the Xbox One. And it doesn't appear to be changing the gender roles in the gaming industry either.
June 11, 2013 - The Atlantic Wire
Francis to religious: 'Don't sweat too much the CDF'
Pope Francis met last week with the presiding board of CLAR (the Latin American and Caribbean Confederation of Religious Men and Women). Reportedly, they had a cordial and informal meeting, with Francis, as he is prone to do, speaking off the cuff.
June 11, 2013 - National Catholic Reporter

off the cuff : Popular Idioms in English