As adjectives the difference between clashy and crashy
is that clashy is (obsolete|regional) wet; rainy while crashy is (computing) tending to crash.
As a noun clashy
is (archaic) a khalasi.
clashy
English
Etymology 1
Adjective
(er)
(obsolete, regional) wet; rainy
(informal) that clash, that do not match or fit stylistically
Etymology 2
Corruption of khalasi.
Noun
(clashies)
(archaic) A khalasi. crashy
English
Adjective
(er)
(computing) Tending to crash.