On the hoof

In its literal sense, 'on the hoof' was a phrase first used by cattlemen and butchers to refer to livestock, mainly cattle, before they arrived at abattoirs. This usage dates from the mid-18th century. By the early 19th century, it had acquired a figurative meaning for walking and/or doing something on the spur of the moment or while on the go. For example, making decisions or doing something like eating etc. while 'on the hoof'.