まぁ、そんなに格好つけるのやめとけよ。

just (e.g. "just wait here"); come now; now, now; tolerably; passably; moderately; reasonably; fairly; rather; somewhat; well...; I think...; it would seem...; you might say...; Hmmm, I guess so...; oh!; oh dear!; oh, my!; wow!; goodness gracious!; good heavens!

so much; so; like that

shape; form; figure; posture; pose; appearance; state; situation; suitable; fit; reasonable; about

to turn on; to switch on; to light up

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

to stop (an activity); to cease; to discontinue; to end; to quit; to cancel; to abandon; to give up; to abolish; to abstain; to refrain

indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!