A "tight ponytail" refers to a hairstyle where the hair is pulled back tightly and secured with an elastic band. It is a simple and neat way to keep your hair out of your face or off your neck. Full definition
In a report on their analysis, published ahead of print in the Journal of the American Academy of Dermatology, the investigators urge dermatologists to better educate themselves about the damaging hairstyles — which include tight ponytails, braids, knots and buns — and advise patients of risks and alternatives. (sciencedaily.com)
I try to avoid tight ponytails because I'm afraid of breakage, so I'll usually do a braid instead. (health.com)
Secure the bottom half of your hair up in a regular tight ponytail before adding the top section to it. (redbookmag.com)