Chris Christie I Wasn't Donald Trump's Hostage

4/2/2016 7:27 AM PDT

Chris Christie finally explained his awkward face behind Donald Trump after Super Tuesday, and the Guv insists he was NOT being held against his will ... as the Internet believes.

Christie traded blows with Jimmy Fallon on "The Tonight" show ... comparing his infamous stance with Trump to what Jimmy would look like standing behind Jay Leno. -- but of course Fallon got the last laugh.

Watch the clip, Christie claims there really was a reason he looked that way. Not sure Fallon bought it though.