Well tha knows I'm from Yorkshur, Gods County, English is almost a second language to missen.
Split it into two parts, Si Thi, slow it down, See Thee & there you have it.
I sithi wen 'n donit. I see you went and did it.
I sithi. I can see you.
Sithi. Usually said as meaning see you later. Or goodbye.
Oooh, tq. I didn't get all that when I googled. thx again