riffling

To flow over a swift, shallow part of a stream.

To ruffle with a rippling action.

To skim or flick through the pages of a book.

To leaf through rapidly.

To shuffle playing cards by separating the deck in two and sliding the thumbs along the edges of the cards to mix the two parts.

To idly manipulate objects with the fingers.

To prepare samples of material using a riffler.

Sampling by use of a riffler