Doodledog
I don't mind 'meeting up', but 'meeting with' sounds wrong to me. 'I met Fred yesterday', says it all - there is no need for I met with Fred'. He would have to be there for you to meet him. I suppose we could have 'I met up with Fred' to be really irritating 
In grammatical terms:
Formal pre-arranged - to meet with + definite article = I met with Fred/the board/the director
Informally or by chance - met + definite article = I met Fred in the high street
Meeting up with is a (usually American) aberration of to meet with and is often misapplied both formally and informally
Really pedantic!