i tried that this is what i got
mob
icon = 'guy.dmi'
icon_state = "guy"
var/frozen = 0
verb
north()
set hidden = 1
if(!usr.frozen)
step(src,NORTH)
sleep(5)
lol
var/a = get_step(usr,SOUTH)
for(var/turf/b in a)
if(b.density == 0)
step(src,SOUTH)
goto lol
east()
set hidden = 1
if(!usr.frozen)
step(src,EAST)
dir = EAST
sleep(5)
lol
var/a = get_step(usr,SOUTH)
for(var/turf/b in a)
if(b.density == 0)
step(src,SOUTH)
goto lol
west()
set hidden = 1
if(!usr.frozen)
step(src,WEST)
dir = WEST
sleep(5)
lol
var/a = get_step(usr,SOUTH)
for(var/turf/b in a)
if(b.density == 0)
step(src,SOUTH)
goto lol
Login()
usr.Move(locate(1,7,1))

if you notice it gets var a which is spost to be the turf south of your guy