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'I don't give a rats ass' is a similar phrase to 'I don't give a shit'.This basicaly means that the person who uses these words doesn't care about the circumstance whatsover.Literally,it means the person doesn't care about that situation even to the extent of a rats ass!
Person 1-Hey mate,My girlfriend presented me with a mobile
Person 2-What do you expect me to do? I dont give a rats ass about it!
by Vinks July 22, 2014