"Touch base?"

My guy friend said "I'll touch base with you later." last night when hanging up the phone with me. The phrase I get, but I don't get it coming from him because I've known him for 7 years and I've never once heard that out of his mouth. He's a guys guy and it's always, "I'll shout at ya later," or something like that. Does it mean he has something (important) to say? I was hanging out with my girl friends when he called... It's the weirdest thing I've heard him say and it's obviously still bothering me. Petty, I know. But it's so different I can't help but think there's a reason.
"Touch base?"
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