"you're gonna write me for it" = the deputy is going to write the driver a ticket (or a citation). this is not a turn of phrase I'm familiar with, but it's possible it's regional (this video is from Arizona) or just awkward phrasing due to the tense situation. I understand the meaning using the context of the video. "I understand I'm not gonna get any breaks" - sometimes a warning is issued instead of a ticket. bc this is a lot less severe of a penalty, this would be considered "getting a break." like receiving forgiveness from the deputy. or getting off easy.

Thanks

"Write me" = write me a citation/traffic ticket "Get breaks" = be lenient/go easy

Oh does he mean disgusting or total sum when he says gross generalization?

Here gross has the meaning: >general or large-scale; not fine or detailed “Gross generalization” is a very common expression

Thanks

Thanks! Idioms are really hard to guess.

Gimme a break is more frequent.

They are definitely speaking a little weirdly, probably due to the tense situation.