the.com/holler

means To shout loudly, or to call out to someone — often used in the sense of reaching out or getting in touch.

from An altered form of 'hollo' (or 'hollow'), an old shout used to attract attention, related to cries like 'halloo' used in hunting to urge on hounds. The word settled into American English, especially Southern and Appalachian speech, where it picked up its folksy, long-distance warmth — 'holler at me' now means 'call me' as much as it means 'yell.'