The president has a name for dismissing someone via Twitter.

POTUS calls it a “Tweet Smack,” The Post has learned.

A source says that he has been with Trump when he boasted about one of his angry tweets and used that term.

Some of POTUS’s tweets are infamous, and his output is also noteworthy.

A Citigroup analyst’s study shows that Trump has tweeted during every hour of the day since taking office and his most frequent tweets are between 9 a.m. and 10 a.m. — which sometimes coincides with his daily intelligence briefing, according to White House Daybook scheduling — and from 11 p.m. to midnight.