tsutsu lujvo

x1 is thicc [voluptuous, zaftig, curvaceous]

This word is slang. By convention, reduplication (doubling of a word) is used to exaggerate the meaning. See also tsatsa

In notes:

ci'inla
x1 is slender (thin in an attractive way).
tsatsa
x1 is ripped / burly / hefty / hulky / strapping