Slang for being be calm, relaxed, and ready to accomplish anything in front of them such as a stressful activity. This can be used after calming down after an emotional blow up.
After freaking out Allison took a deep breath and contained herself. Someone asked "Are you doing okay Allison?" to which she emphatically replied "I'm as cool as a zipper!"
Tony said to his wife "I've been holding back the helium all night long just for you"
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