。
Don't forget to count me in.
Literal
Not-forget-[without-ず] me [object-を] include-[give-me-てくれ] [emphasis-よ]
~てくれよ is the masculine casual request form with よ tacked on for emphasis. The よ makes it slightly pleading or insistent, like English 'make sure you do' or 'come on, include me'.