When a person goes to itch the inside of there ass cheeks not knowing that they previously did not wiped good enough. When they pull there finger back out and look at it, it has a light brownish tint covering it from sweat and feces that resembles mustard.
Dude my asshole was itching bad. I should have done a safety swipe before i scratched it because I ended up with mustard finger.
by Cangri518 September 05, 2011
When upon the act of fat fingering a button on a controller or remote, mustard begins to seep from the pores on the pad of said finger.
by Mustard-Fanatic March 28, 2021
p1> omg. ryan was so jacking off in math class!
p2> woo! go mustard fingers!
p1>hey mustard fingers! what'd you do yesterday?
p2>masturbate! what else, nigga!?
p2> woo! go mustard fingers!
p1>hey mustard fingers! what'd you do yesterday?
p2>masturbate! what else, nigga!?
by fetusraper April 20, 2008
The act of dipping your index finger in mustard and fingering someone right after without them knowing
Bro! Me and my girl were getting freaky last night. As we were fucking i hit her with the Mustard Finger Surprise.
by Poodery January 03, 2024
The act of dipping you index finger into some mustard then proceeding to finger blast someone while yelling "SURPRISE" from behind
by Poodery February 16, 2025