In English, il y a une bête dans mon pantalon means "there is an animal in my pants".
In my satchel. Dans, In. Mon cartable, my satchel.
It means 'in my bag' in French. Dans mon sac j'ai ... means "In my bag I have ..."
You are in my heart and in my mind (literally: head).
"Dans mon opinion" or "De mon avis"
"l pleur de mon cour" doesn't mean anything in French. But "Il pleut dans mon coeur" means 'it is raining in my heart".
"... may party in my trousers"
Où est mon pantalon means 'where are my trousers' in French.
The French translation for "there are ants in your pants" is: Il y a des fourmis dans votre pantalon. If you wanted to say "there are ants in my pants", then it would be: Il y a des fourmis dans mon pantalon.
In my satchel. Dans, In. Mon cartable, my satchel.
dans mon placard means 'in my cupboard' in English.
in my college
It means 'in my bag' in French. Dans mon sac j'ai ... means "In my bag I have ..."
My damp pants
mettez de l'ananas (some pineapple) / un ananas (a pineapple) dans mon pantalon, s'il vous plaît.
'in my living-room'
You are in my heart
toujours dans mon propre petit monde means 'always in my own small word' in English.