Where does “ебати” come from?

ебати (Slavic) comes from Bulgarian ти, from Proto-Slavic ty, from Proto-Balto-Slavic tūˀ, from Proto-Indo-European túh₂ — you, thou.

Ancestry of “ебати”, step by step

StepLanguageWordMeaning
1BulgarianтиYou, thou; to you, for you, you; your
2Proto-Slavictyyou
3Proto-Balto-Slavictūˀyou
4Proto-Indo-Europeantúh₂you, thou
Every word from Proto-Indo-European túh₂ →Every word from Proto-Balto-Slavic tūˀ →Every word from Proto-Slavic ty →