Aposiopesis [ap-oh-sahy-oh-pee-sis]
noun
Means
A sudden breaking off in the midst of a sentence, as if from inability or unwillingness to proceed, usually indicating rage or frustration/exasperation. As in "Why I oughta..!" or "One more step and I'll.."
Comes from
From Late Latin aposiōpēsis, from Greek, aposiōpān, to become silent: apo-, intensive pref.; see apo- + siōpān, to be silent (from siōpē, silence).
Read it
Frustrated with the decreasingly funny sentence uses from