spew verb spewed; spewing; spews Definition of spew (Entry 1 of 2) intransitive verb 1 : vomit 2 : to come forth in a flood or gush 3 : to ooze out as if under pressure : exude transitive verb 1 : vomit 2 : to send or cast forth with vigor or violence or in great quantity a volcano spewing out ash —often used with out spew noun Definition of spew (Entry 2 of 2) 1 : matter that is vomited : vomit 2 : material that exudes or is extruded