"He farted by my face. And walked away."
That's NY Giants running back Wayne Gallman with a seriously stank allegation against Eli Manning ... claiming the QB hit him with one of the most aggressive crop-dusts of all time.
The 26-year-old RB blew the lid of Manning's putrid secret during a Q&A with NY Post columnist Steve Serby ... when he was asked to recall his favorite Eli memory during their time together in NY.
That's when Gallman dropped this [butt] nugget ...
"I wouldn’t say it was my favorite, but this is my most memorable -- we’re in the locker room before a game, he was doing his stretching while I was sitting in my chair listening to music, and he walked by and he farted by my face.