glub /ɡlʌb/noun 1verb 1forms 3 noun1 •(informal) The sound of underwater bubbles, or of water bubbling (often used repetitively).The boat, which was filled with water, instantly—glub, glub—sank. — 2004 verb1 •(informal) To make a sound like underwater bubbling; to glug. formsglubbed · glubbing · glubs