sicky adjective2 •(informal) Prone to sickness; easily becoming ill; (somewhat) sick.I started off with 18 sleepsuits, but got through them in 24 hours when she was sicky. — 1996 •(informal) Covered in vomit.Also consider how easy is it to clean with a sicky baby; can all of the cover and straps go in the washing machine or is it wipe clean only? — 2011 formsmore sicky · most sicky