1. to repeatedly borrow small items reduced to units with no intention of returning the favor, while avoiding the use of alternative resources such as a credit card
2. to acquire small items (typically consumable) from friends in small increments or slices by pleading poverty, even though alternative means are available.
3. to mooch despite available personal funds or resources.
I can't believe Keith vandersliced me out of 3 beers at the bar... I saw him using his own credit card later that night!
I saw her vanderslicing cigarettes during the entire concert, only to later use her own cash to buy shirt for the merch table.