Chunking is a rhythm guitar

Rhythm guitar

Rhythm guitar is a technique and rôle that performs a combination of two functions: to provide all or part of the rhythmic pulse in conjunction with singers or other instruments; and to provide all or part of the harmony, ie. the chords, where a chord is a group of notes played together...

 technique in which the chord

Chord (music)

A chord in music is any harmonic set of two–three or more notes that is heard as if sounding simultaneously. These need not actually be played together: arpeggios and broken chords may for many practical and theoretical purposes be understood as chords...

 is muted by lifting the fret

Fret

A fret is a raised portion on the neck of a stringed instrument, that extends generally across the full width of the neck. On most modern western instruments, frets are metal strips inserted into the fingerboard...

ting fingers immediately after strumming. Alternatively, the bass note

Bass note

In music theory, the bass note of a chord or sonority is the lowest note played or notated. If there are multiple voices it is the note played or notated in the lowest voice. While the bass note is often the root or fundamental of the chord, it does not have to be, and sometimes one of the other...

 can be played and allowed to ring, with the remainder of the chord being "chunked" on the up beat. This technique is usually used in a rhythmically simple manner, such as chunking on every beat, or bass notes on down beats and chunking on up beats. Freddie Green

Freddie Green

Frederick William "Freddie" Green was an American swing jazz guitarist. He was especially noted for his sophisticated rhythm guitar in big band settings, particularly for the Count Basie orchestra, where he was part of the "All-American Rhythm Section" with Basie on piano, Jo Jones on drums, and...

 and Django Reinhardt

Django Reinhardt

Django Reinhardt was a pioneering virtuoso jazz guitarist and composer who invented an entirely new style of jazz guitar technique that has since become a living musical tradition within French gypsy culture...

are known for this technique.