Play throughout:

G|------------------------------
D|------------------------------
A|-00000-1-0---0--0000-1-4-1-0--
E|------------------------------

After he says "dude!" you hear a high pitched tune, later on in the song that same part plyaes deeper. here's the tab for the high pitched part on a 6 string, just play ir on your A string for the deeper version.

e|-0--12-13-12--0--10 12-10-10-8----0--7-8-7--0--5-7-5-5-4-
B|---------------------------------------------------------
G|---------------------------------------------------------
D|---------------------------------------------------------
A|---------------------------------------------------------
E|---------------------------------------------------------

And the bass for the deeper part:
G|---------------------------------------------------------
D|---------------------------------------------------------
A|-0--12-13-12--0--10 12-10-10-8----0--7-8-7--0--5-7-5-5-4-
E|---------------------------------------------------------