Meaning of last "te" of saki ni itte te (先に行ってて)


I always hear people saying

[code]

    　　　先に行ってて　which means 'go ahead' 
    
[/code]

But I don't really understand the meaning of the last て. I know it's the
abbreviation of いて but if I translate it to English, I always think like this.

[code]

    　　　先に行っていて - Going ahead
    
[/code]

So anyone can explain the latter 'te' of this sentence?




As you said, 「行っ **てて** 」 is the colloquial contraction of 「行っ **ていて** 」 and
we almost always use the contracted form in informal speech.

There is, however, a fairly big difference in meaning between 「先に行っ **て** 」
and 「先に行っ **てて** 」.

「先に行って」 simply means "You go first."

「先に行ってて」 means "You go first and wait for me/us." or "You go first and I/We
will follow you."




As you said, 「行っ **てて** 」 is the colloquial contraction of 「行っ **ていて** 」 and
we almost always use the contracted form in informal speech.

There is, however, a fairly big difference in meaning between 「先に行っ **て** 」
and 「先に行っ **てて** 」.

「先に行って」 simply means "You go first."

「先に行ってて」 means "You go first and wait for me/us." or "You go first and I/We
will follow you."

