centimetre
A small unit of length, based on the metre, there being 100 centimetres in 1 metre. Abbreviated to cm. The width of an average man's finger nail on his little finger is usually 1 cm.
The doctor measured the boy and he was 147 cm tall. The boy was pleased as he was 1 centimetre taller than he was last year.
centimetre perfect
When something is executed with legendary precision.
Steve bounced the beer pong ball off Dave's forehead into his beer cup as he was drinking it. It was centimetre perfect.
23 Centimetre Nails
Nine Inch Nails if they used the metric system.
23 Centimetre Nails, or TTCN, doesn’t make a good band name.
3 centimetres
small penis size
Boy: This is my dick I wanna stick it in you
Girl: *pulls out ruler from her pocket*
Girl: 3 CENTIMETRES??? THATS SO SMALL
Girl: *pulls out ruler from her pocket*
Girl: 3 CENTIMETRES??? THATS SO SMALL