'Titanic arse' can be used to describe a humungous backside; Someone with an arse this big looks like he or she could topple backwards any moment and literally SINK into the ground, hence 'titanic'
meena says; 'wow... her rear end is so big it has the ability to crush anythin in its way, like the titanic did'

aish says; 'now THATS what you call a titanic arse'
by lil_naz December 22, 2007
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