Green’s Dictionary of Slang

(US campus) enormous, huge.

1989		P. Munro Sl. U. 110: We have a honking textbook in my management class.
1992		D. Burke Street Talk 2 19: Can you believe the honkin’ amount of homework I have to do?
1997–2002		Hope College ‘Dict. of New Terms’ 🌐 honkin adj. Physical state of object, person, or thing that is relatively big, large in size.