Reduplication

Duples

khuikhuy (khuy+khuy; 開開; very open)
khiuxkhiu (QQ/糗; chewy)
LKK
peh-phauphaw, siok phahphvae, etc. (Online Abbreviations)
tataf (taf+taf; very dry)

Triplication

In Taiwanese, triplication refers to repeating a syllable three times for emphasis. For example, "aang" means "red". Something extremely red is "aarng'ang'aang" (紅紅紅). Generally, the first syllable must undergo tone change to the rare rising tone (#6).

kaao'kauxkau
zeerng'zexngzeng
kiirm'kimkym
khuiie'khuikhuy 開開開
thoor'thothoo
kao'kaokaux
sirn'sirnsixn
kof'kofkor
lefng'lefnglerng
seek'segsek
took'togtok
siaap'siapsiab
siip'sipsib