The phrase "huge shout" means to give a loud and enthusiastic expression or recognition to someone or something. It implies showing appreciation or support in a big way. Full definition
HUGE HUGE HUGE shout out to Kate who answered all my emailed questions... I have severe mom brain and may have asked things twice.. (itsamomlife.com)
Baby Eczema: One Family's Journey Guest Post by father of Nellie, Justin Chan A huge shout - out and thanks to the Chan family for sharing their experience here! (boogordoctor.com)
Huge shout out to my Aunt Martha for some more Christmas loot. (mybizzykitchen.com)