In two shakes Definition 1 of 1Pro Tip 1/3Informal Use The phrase 'in two shakes' is casual and usually used in informal conversations. Just fix this widget, and I'll be done in two shakes! Pro Tip 2/3Speed Indication 'In two shakes' suggests something will happen very fast, almost immediately. Hang on, I'll get your book from upstairs in two shakes. Pro Tip 3/3Friendly Tone Using 'in two shakes' often conveys a friendly, reassuring tone to the listener. Don't worry, we'll be on our way in two shakes.