Forget Sicko Mode ... it was more like Slippo Mode for Travis Scott at the Knicks vs. Nets game Wednesday night -- 'cause a loose ball caused the rapper to spill his drink all over the Barclays Center floor!!!
The incident happened at the start of the fourth quarter of Brooklyn's tilt with NY ... when Immanuel Quickley lost control of a basketball on the court -- and it made a beeline for Scott's right hand.
Check out video from the game's broadcast .