Laying underneath the palm trees (yeah, yeah)
The boys, break their necks
Trying to creep a little sneak peek, at us

from Katy Perry (Ft. Snoop Dogg) – California Gurls Lyrics on Rap Genius

Meaning

The correct line I believe is “Layin' underneath the palm trees (undone)” meaning that their bikini tops are undone to avoid tan lines. The boys are turning their heads as they walk by so far around to see the girls with their tops undone that they risk breaking their necks from twisting them so far.

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