lolcow in English dictionary lolcow Meanings and definitions of "lolcow" (Internet, slang, derogatory) A person whose eccentric or foolish behaviour can be exploited to amuse onlookers. noun (Internet, slang, derogatory) A person whose eccentric or foolish behaviour can be exploited to amuse onlookers. more Grammar and declension of lolcow lolcow ( plural lolcows) lolcow (plural lolcows) more Sample sentences with "lolcow" Declension Stem Try again Authors