Sebastian Telfair tells TMZ Sports he wants Donald Trump to help him avoid a lengthy stay behind bars this year.

The former NBA star is scheduled to report to prison on Tuesday ... after he violated the conditions of his supervised release in his healthcare fraud case -- but he's hoping No. 45/47 can get him out of it. Getty

Telfair said he believes the whole situation is "definitely some bulls***" ... and he's confident if POTUS hears his story, he can avoid the six-month prison sentence he's about to begin serving in a matter of hours.

"Trump," he told us out in New York City on Monday, "go check in on my story and you're definitely going to want to pardon me. You'll hold me accountable and want me to continue to go do good. But I did too good to being sending anybody to

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