Idiom. To be worthless; not worth anything at all.
Derived from the informal use of the word 'squat' BrE
skwɒt NAmE
skwɑ t as having the same meaning as 'diddly-squat'
'dɪdlɪˌskwɒt (also doodly-squat
'dudliˌskwɑt) : nothing, anything at all, not anything.
Note: "diddly" and "squat" each are used in NAmE as having the same meaning as 'diddly-squat'.
1-Actions speak louder than words; words alone count for squat.
2- "He is sending you flowers in hopes of improving your opinion of him"
"It doesn't count for squat. He is still the same person."