There is no word "hahaha" (ההה) in Hebrew. If you just kept writing the letter "hey" (ה) in Hebrew, it would be interpreted as laughing (just like hahaha is interpreted in English as laughing), but it does not mean anything.
If you mean the word Hadassah, it is הדסה, hah-DAH-sah.
"hah-LIE-lah"or"hah-LIE-lah hah-ZEH"
hashir hagadol (hah sheer hah gah DOHL)
הללויה (pronounced hah-leh-lu-yah), means "praise God"
"At this time" in Hebrew is "Baz-man Hah-zeh" (בזמן הזה).
beh-ah-hah-VAH (באהבה)
lehagish, pronounced "leh-hah-GEESH"
"NAH-ahr hah-YEE-tee"
Ve'hishtahavu is pronounced as veh-hee-shta-HAH-voo. The emphasis is on the "HAH" syllable. This Hebrew term translates to "and they will bow down."
to believe: להאמין, leha'amin pronounced: leh-hah-ah-MEEN. This word is the same in both ancient Hebrew and Modern Hebrew.
he did it by accident but if he repeats it over and over everyday he is falling for you !hah hah hah!
Haganah (הגנה) is pronounced hah-gah-NAH