Because you are using un coca, your phrase means "a coca plant." Un Coca means "a Coke," and une coca means "cocaine."
"Un coca" is an informal way of saying "a Coke" in French, referring to a Coca-Cola soda drink.
"J'ai un" in French translates to "I have a" in English.
Un cadeau translates to a gift in English.
dans un village means 'in a village' in French.
You can say "c'est un but" to mean "it's a goal" in French.
The French word "un sapin" translates to "a fir tree" in English.
Coca is called the same in French: un coca (masc.).
Un coca-cola is masculine.
A Coca-Cola
"un bus" is a bus in French.
un four is an oven in French
un sac is a bag in French.
un crâne is a skull in French.
un survêtement is a tracksuit in French.
"un crayon" (masc.) is a pencil in French.
"J'ai un" in French translates to "I have a" in English.
un serpent is a snake in French.
un poussin is the name for the chicklet in French.