This is the term used when we just start to animate without planning the key frames and see how it turns out. Fast crazy action scenes are usually drawn straight ahead as they are more spontanious.
Using Disney's 12 Principles of Animation in Your Next Web Design Project
12 Principles of Animation: Straight Ahead Action and Pose to Pose
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12 Principles of Animation (from the book The Illusion of Life)
12 Principles of Animation
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Motion & Animation: A New Mobile UX Design Material — Smashing Magazine
12 Principles of Animation: Straight Ahead Action and Pose to Pose
Animation Principles