I've looked at the other tabs for this song and I've tabbed a more fretting—friendly 
version :—

Artist : The Pixies
Written by : Black Francis/The Pixies
Song : Gigantic

This is a simple bass line but still catchy

————————————————————————————————————————————————————
————————————————————————————————————————————————————
———5——7—7———2—2——3——5—5—————5——7—7———2—2——3——5—5————         etc...
—3——————————————————————3—3——————————————————————3—3

This is repeated the whole way through, listen to the song to get the tempo.

      Tabbed by The Dirty Monk