pom · noun1
Clipping of pomegranate. In reference to the British, first attested in Australia in 1912 as rhyming slang for immigrant with additional reference to the likelihood of sunburn turning their skin pomegranate red. As a cocktail, originally American.
Pom · noun2
Clipping of Pomeranian, q.v.
Etymology from Wiktionary, CC BY-SA 4.0.