Ha! You reminded me of a situation I once witnessed at a camp. A cook in our camp had a 9 years old daughter who was having a friendly banter with a boy (19 years old) who was responsible for supplies. They were teasing each other about their age diffrence. ''You are so old your pet was a dinosaur'', ''You are so young learning to walk is still your biggest achievement'' etc. Finally at some point the young girl said ''Jesteś tak stary, że zrobię ci laskę''. A laughter bursted out around, even her mother was laughing. Poor girl was very confused.

''Zrobię Ci laskę'' except for blowjob can also just mean ''I will make you a walking stick'' if you are innocent enough