Splutter
/ˈsplʌtər/
Definition 1 of 2
Pro Tip 1/3Emotional Reaction
Used when someone is overcome by strong emotions like shock or excitement. 
She spluttered her thanks through tears of joy.
Pro Tip 2/3Unexpected Moments
Often used when someone is caught off-guard or is unprepared for a situation. 
When he won the award, he spluttered, unable to form coherent sentences.
Pro Tip 3/3Informal Speech
More common in casual conversation rather than formal speech or writing. 
In the middle of the argument, he started to splutter out excuses. Compare with
ChokeCoughGaspHissSpitSputterStutterWheeze
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