Do you speak Donald? Trump mocked for Indiana victory speech promising his supporters they will win 'BIGLY'

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Donald Trump has been mercilessly mocked for using his Indiana victory speech to declare his supporters were going to 'win bigly' in the coming months.

The use of the archaic word caused a storm on social media, with many lambasting the GOP leader for his outdated vocabulary.

It also marks just one of a series of grammar faux pas for the businessman, both in live discussions and on Twitter.

Donald Trump tells supporters they will all 'win bigly' if he is elected to the White House during his Indiana victory speech. The bizarre use of the outdated word prompted ridicule on social media

After he was declared the Republican winner in Indiana last night, Trump said: 'We’ve been losing all the time, we lose with our military, we can’t beat Isis, we lose with trade, we lose with borders, we lose with everything.

'We’re not going to lose, we are going to start winning again and we’re going to win bigly.'

While some speculated he may have said 'big league', which is a reasonably common colloquialism on the East Coast, others began questioning his choice of phrasing.

'Did Trump say bigly?' one Twitter user queried.

Another user, named Dan, wrote: 'According to Trump, America will start winning bigly with him as President. Sure.'

Others were less kind. Sam Gehler said: 'The "presumtive" GOP nominee just started his speech by saying "we're going to win bigly". Congrats guys.'

A bewildered James Jeffrey said: '"We're going to win bigly", says Trump, in an actual real moment.'

It comes just after a separate study found that Trump speaks at a sixth grade level.

Carnegie Mellon University's Language Technologies Institute found that most presidential candidates use words and grammar that are typical of students in grades six through eight.

A historical review of their word and grammar use suggests all five candidates in the analysis - Republicans Trump, Ted Cruz and Marco Rubio, and Democrats Hillary Clinton and Bernie Sanders - have been using simpler language as the campaigns have progressed.

Again, Trump differs from the group, as his grammar use spiked in his Iowa Caucus concession speech and his word grammar and usage plummeted during this Nevada Caucus victory speech.