WHAT DID HE MEAN BY THIS COMMENT??

this is about a guy who i know for a fact likes me..

he called me a couple of days back.. i was out and coming home late from work so i missed his call, i then messaged him saying sorry i can't speak right now i'm out and wont be back till later ill call you back if i can, but don't wait for my call...(just incase im home too late in the middle of the night)..he said "thats ok"

next day he might have thought i would get to call him but the same thing happened..as in i was out till late..and i texted him telling him im sorry but im out again so wont be able to call you today either...

and when i was out it was snowing..and the roads were very icey of course...

he messaged me back after i said i could not call him a couple of hours later
and he texted saying " i hope you slip lol"..but he put the lol in it...

so is that like a guys sense of humour— is it supposed to be funny? i certainly wasnt laughing but then i don't know what way i should take that comment

it was such a random comment as well...

or is he being serious? that he secretly hopes i do slip??