Can anyone tell me what this sentence means?

[gibbousmoon]

そろそろおっさんに片足をつっこんでますね。
I'm assuming it's an idiomatic expression of some sort. I'm clueless.

 

[The7thSamurai]

I've no idea, but it's been posted on Google if you want to try and sift through it all.

"おっさんに片足を" - Google Search

You could try refining the search too.

 

[NANGI]

Konnichiwa gibbousmoon-san!

そろそろおっさんに片足をつっこんでますね。

I am(or you are) nearing middle age(old man).
I(or you) will reach the generation of middle age(old man) soon.
そろそろ:"sorosoro" means "soon".
おっさん:"o ssan" means "middle age(old man)". This is a slang and you should not use this word.
片足をつっこむ:"kataashi wo tukkomu" means "reach, join, come".
NANGI

 

[gibbousmoon]

Thanks Nangi.

Now I have to decide whether to get pissed at him for calling me an "old man."