The first two are quite informal. Lend a (helping) hand / help you out / be of assistance: more formal, but still common.
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michaeltingI think thatLol. Interesting example.
"I got you"
"Lemme help you"
These are broken English.
As for 'on this one', I think it means an event, rather than a time.
M : I hate the teacher. I am going to kill his dog.
J : I got your back on this one.
M : Let's go!
michaeltingAs for 'on this one', I think it means an event, rather than a time.Correct. An event. More accurately, occasion. I've got your back on this [one / occasion]. occasion is too formal for this context, but that's the meaning.
michaeltingBy broken English, I mean that there is no such word as 'lemme'. 'I got you' is also informal and people might be confused by what it means.Anyone who's a native speaker will know exactly what you mean. If they aren't, you probably should avoid colloquial expressions like "I've got your back" as well.
michaeltingBy broken English, I mean that there is no such word as 'lemme'. 'I got you' is also informal and people might be confused by what it means.http://dictionary.reference.com/browse/lemme