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1.
a sugar high from eating too many mentos

a sugar high
"I love Mentos candy. I always want more, because they are mine! Momentos!"
by auburnMOJO March 26, 2010
 
2.
When one forgets. A forgetful person.
Charles: "Yo wat up Bobby? Wacha doin?"
Bob: "U know, gettin' da auto-mobile washed on a beauutiful day, brotha."
Charles: "Cool cool..."
Charles: "Yo wat up Bobby? Wacha doin?"
Bob: "Nigga, I jus told you. U havin a momento moment?"
by J4 February 25, 2004