And these words you said have been reduced to some swear words in Cantonese.
6= Lu; 7= Qi; 9= pigeon.
67= Luqi; 69= Lu dove, which means rooster.
Seven strokes and two strokes are definitely not the same thing as seven strokes and eight strokes. Up and down is to describe people's anxiety about something. It is swearing, doing things without knowing the so-called, fooling around without knowing the reason.