The 45-year-old says the tunes written by brother Noel such as Champagne Supernova and Supersonic are lost on him.
And he also said he is puzzled by the words of his latest single Bold – even though he wrote them himself.
The ex Oasis singer said: “I just got on with it. I certainly don’t know what half of them mean.
“Supersonic? I don’t know what that means. Champagne Supernova? I don’t know what a lot of that stuff means.
“I don’t even know what Bold means.”
The Roll With It singer added: “I can sing anything and it’ll mean something because of the way I sing it.
“When I look at the lyrics I don’t go, ‘What’s this about?’ Not everything has to have a meaning. Life: what does that mean?”
Liam added that he would have walked away from music if his new material had not gone down well with fans.