To make it clear: hari Selesa is once in a week, the moment of ‘hari selesai’ seven times a week, including moment of ‘hari Selesa selesai’.
Pasti kamu suka hari Selesa?! – (Are you) sure you like Tuesdays?
Yakin aku bilang begitu? – (Are you) sure I said so?
Remark: you have to read more examples to get it right, when to use pasti and yakin, both meaning sure.
Mungkin aku bilang aku suka klo hari kerja selesai – Maybe I said that I like (the moment) when the day is over
Klo = kalau (slang of text messages)
Using internet slang of bhs (bahasa) Indonesia is part of normal daily life in Indonesia. What else would you do if you spend 3-6 hours a day in traffic jam? You communicate.