Where does “fekker” come from?

fekker (Senhaja De Srair) comes from Arabic فكر, from Arabic فِكْر — thought; thinking, thought.

Ancestry of “fekker”, step by step

Step	Language	Word	Meaning
1	Arabic	فكر	to think, ponder over; to reflect, to meditate,...
2	Arabic	فِكْر	thought; thinking, thought