In hip hop musicsampling, chopping is the "altering [of] a sampled phrase [or break] by dividing it into smaller segments and reconfiguring them in a different order." (Schloss 2004, p.106)
Source
Schloss, Joseph G. (2004). Making Beats: The Art of Sample-Based Hip Hop. Middletown, Connecticut: Wesleyan University Press. ISBN 0-8195-6696-9.